1.Two haploid gametes fuse to form a diploid cell, 2.Homologous chromosomes separate from one another during meiosis I, 3.One diploid cell produces four haploid cells, 4.Sister chromatids separate from one another during meiosis II the centrioles move toward opposite poles. cross-over occurs during prophase I. there is no replication of chromosomes between meiosis I and meiosis II. During metaphase of mitosis the duplicated chromosomes are at the metaphase plate while during metaphase I of meiosis the bivalents are present at the metaphase plate. B) a precursor cell that becomes an egg cell. Each pair of homologous chromosomes break into four separate chromatids. a. the chromosome copies attach to the plasma membrane and are pulled apart by cell growth Karyokinesis occurs once in mitosis and twice in meiosis. In meiosis, daughter cells are haploid. A lattice holds the members of a bivalent together in such a way that the RNA of the non-sister chromatids is aligned. True or False, Which of the following is NOT a difference between anaphase 1 and anaphase 11, anaphase 1 occurs in a haploid cell while anaphase 11 occurs in a diploid cell, The picture depicts which of the following changes in chromosome structure. B. C) In mitosis, there are two daughter cells. D) Chromatin will condense into chromosomes. A. prophase I of meiosis I B. anaphase I of meiosis II C. telophase I of meiosis I D. prophase II of meiosis II E. anaphase II of meiosis I. Homologous chromosomes are similar in all of these characteristics EXCEPT: A. similar in size. During _______________ the homologous chromosome pairs separate in a random fashion leading to genetic diversity among the offspring. C) It is a significant source of genetic variation only during meiosis I. how many days after the start of the mother's last menstruation is the birth of the baby expected to occur? In order to create a diploid organism, the uniting cells must be haploid so as to maintain the constant chromosome number in the baby. During which phase of mitosis and meiosis will the state of the chromosome be the same? B. Meiosis fails to proceed to completion. B. reduction of chromosome number (from 2N to N). D. Trisomic and aneuploid. Monosomy occurs when an individual has only one of a particular type of chromosome. [Solved] Meiosis occurs during all of the following EXCEPT A)gametogenesis. answer choices. True or False. A) 26 Find the equilibrium point. List five examples of electromagnetic radiation. D) In mitosis, the daughter cells are genetically identical. False The correct number of chromosomes in a species is known as euploidy. Consider that all other relevant characteristics are similar between these species. Monosomy occurs when an individual has only one of a particular type of chromosome. ; In most cases, cytokinesis (the division of the cytoplasm) occurs at the same time as telophase I.; At the end of telophase I and cytokinesis, two . If a sperm cell contains 8 chromosomes, it comes from an animal that has ______ chromosomes. What is the function of polar bodies? All of the following are true of meiosis except. It increases the likelihood that daughter cells contain different genetic material. Sex chromosome aneuploids are better tolerated and have a better chance of producing survivors. 120 seconds. 1. Which of the following would NOT contribute to genetic variation? Find the slope of the secant line in part (a), and interpret your answer in terms of an average rate of change over the interval. d. A, B and C, all involve in meiosis can nonreciprocal translocation be balanced, an even exchange of material with no genetic information extra or missing, and ideally full functionality, where the exchange of chromosome material is unequal resulting in extra or missing genes. Which of the following statements about the process of meiosis is correct_____ A. Homologous chromosome association occurs before chromosome duplication. A. Cri du chat syndrome If a cell contains 12 chromosomes at the end of meiosis I, how many chromosomes will the daughter cells contain at the end of meiosis II? One chromosome of the pair came from mom, the other from dad. It increases the likelihood that daughter cells contain different genetic material. D Interkinesis can be variable in length. E. In meiosis, the daughter cells are genetically identical. A) at ovulation B. oogenesis. The interphase is subdivided into {eq}\rm G_1 {/eq} phase, {eq}\rm S {/eq} phase, and {eq}\rm G_2 {/eq} phase. No fertilization can occur, and the eggs develop into female lizards. All of the following are true of meiosis, except a) there are two cell divisions. Gastrulation is the first major process that occurs during prenatal development. bivalents will form. Sources of genetic variation in a sexually reproducing population include(s) which of the following? A) gamete production. As described above, homologous chromosomes are like pairs of non-identical twins. cells divide only once. A. C) They carry genes for the same traits. Monosomy occurs when an individual has only one of a particular type of chromosome. Jacobs syndrome, XYY, results from nondisjunction during spermatogenesis. Meiosis occurs during gametogenesis, oogenesis, and spermatogenesis. The gametes are the diploid phase of the life cycle. What is its role in males? Disorders of chromosome number include the duplication or loss of entire chromosomes, as well as changes in the number of complete sets of chromosomes. b. independent assortment in metaphase 1 of meiosis Prophase I Answer to: What is the key difference between mitosis and meiosis? B) reduction of chromosome number (from 2n to n). Meiosis I is known as reductive division, as the cells are reduced from being diploid cells to being haploid cells. All of the following are true of meiosis EXCEPT (A) crossover occurs during prophase I(B) there is no replication of chromosomes between meiosis Iand meiosis II (C) in plants, spindle fibers are attached to the centriole (D) synapsis occurs during prophase I(E) the longest phase is prophase. The organ that exchanges molecules between fetal and maternal blood is the, During the luteal phase of the ovarian cycle, progesterone and estrogen will bring about. 4. Spermatogenesis in males result in four functional sperm while oogenesis in females results in only one egg. C) telophase II B. species Y should have a better chance of surviving than species X. C. species X should have a better chance of surviving than species Y. D. neither species should have an advantage in surviving since organisms often become extinct when the environment changes. C. providing genetic variation in sexually reproducing organisms. A. D) Interkinesis can be variable in length. D) prophase II d. All the choice are correct. Angiosperms have dominated the land flora primarily because of their -. In meiosis, there are four daughter cells. D) prophase II We would therefore expect to find 56 chromosomes in the skin cell of an elephant. C. Familial Down syndrome True or False, Interkinesis follows.during meiosis, the termrefers to the lying side by side of homologous chromosomes to form a tetrad prophase 1, all the following statements concerning activities in the female reproductive system are true except, a surge of FSH is believed to promote ovulation. During which stage of meiosis does crossing over occur? The two cells produced in meiosis I go through the events of meiosis II in synchrony. 3. It begins around the second week of embryonic development and involves the formation of the three germ layers - the endoderm, mesoderm, and ectoderm - which give rise to all of the body's organs and tissues. False. chances of a woman having a child with Down Syndrome decreases with her age. Crossing over is a cellular process that happens during meiosis when chromosomes of the same type are lined up. C) A fertilized egg is known as a zygote. B) In meiosis, there are four daughter cells. a. gametes are the only haploid phase of the human life cycle Mitosis uses a diploid (2n) parent cell to form daughter cells containing a haploid number(n) of chromosomes. Meiosis I. Meiosis is preceded by an interphase consisting of the G 1, S, and G 2 phases, which are nearly identical to the phases preceding mitosis. b) homologous pairs separate during meiosis I. c) one cell produces four cells. Which statement is true about the life cycle of plants but not of animals? Atweeks, the fetal heartbeat can be first be heard through a stethoscope, A healthy fetus born at twenty-four weeks has a chance of surviving although it may have, immature lungs and breathing difficulties, The human embryo becomes a fetus at the end of the second month of gestation After penetration of the sperm in the zona, the zona reaction occurs, making the zone impermeable to other sperm. Because even small segments of chromosomes . C) The products of the haploid phase of the life cycle are larger than those of the diploid phase. c. there is no nuclear membrane to break down and rebuild " During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis" (The Biology Project, 1997b, para 2). Explain. A primary spermatocyte has 64 chromosomes. D. Homologues exchange genetic material between non-sister chromatids. Meiosis I DNA replication precedes the start of meiosis I. Prophase I. Sketch a graph of the function and the secant line through PPP and QQQ. After meiosis I, each secondary spermatocyte would have 32 chromosomes. What is the wavelength of radar waves for which the plane is made invisible? E) None of the choices are sources of genetic variation. . C. It regularly produces a wider array of adaptations to the external environment in a shorter period of time. The S phase is the second phase of interphase, during which the DNA of . 4) Select the statement which is true regarding independent assortment. B) Nuclear envelope will dissolve. Normal female 2n offspring result without fertilization. E) None of the choices are true. D. Sperm that contain a recombination of genes are usually more successful in fertilizing an egg. A) independent assortment b. the primitive streak occurs in the morula stage of the embryonic development. C. Fusion of gametes results in trisomy. (4) Power of adaptability in diverse habitat. pangenesis. All of the following events occur during normal meiosis except _______. A) Bivalents will form. The polar body is It is carried out in all tissues that require cell replacement. Describe how errors in chromosome structure occur through inversions and translocations. Which is NOT true about daughter cells of mitosis or meiosis? a. gametogenesis True or False, A change in the chromosomes number resulting from nondisjunction is called euploidy The Phases of Meiosis I. At which stage of meiosis is each chromosome composed of a single chromatid? synapsis occurs during prophase I. down syndrome with ______________________, ____________ results in the mildest symptoms, a small amount of amniotic fluid, which contains fetal tissues, is sampled from the amniotic sac, A tiny tissue sample is taken from the villi of the chorion, Which has a higher miscarriage rate, CVS or amniocentesis, Which test can be done sooner, CVS or amniocentesis, principles of fetal trisomy 21 testing from a maternal blood sample using DNA sequencing, Partial translocations in what disorder allow us to map locations of parts of the disorder. One main reason would be: A. D) During anaphase I of meiosis, the homologues pairs separate; during anaphase of mitosis, the homologous pairs stay together. Which of the following is not a characteristic of homologous chromosome? E. All of the choices are true. Which of the following errors most likely produces this condition? About 90 percent of a cell's time in the normal cell cycle may be spent in interphase. An individual who inherits XO will show symptoms of ___________ syndrome. D. the cell produced when fertilization occurs. B) The desert is relatively uniform and there is little advantage to maintaining variation, but the animal has not been able to completely evolve away from its heritage of sexual reproduction. Explain. D) It increases chromosome condensation. Is modified post-fertilizaion to block polyspermy. Chromosome disorders can be divided into two categories: abnormalities in chromosome number and chromosome structural rearrangements. All of the following are true about the chromosomes of a multicellular organism EXCEPT: A. iv. D. Tetrads line up and separate into individual homologous chromosomes. E. Homologues interact with the spindle as if they were one chromosome. B. In metaphase individual chromosomes (pairs of chromatids) line up along the equator; During anaphase the sister chromatids are separated to opposite poles The haploid cells are genetically different from each other due to crossing over in Prophase I and independent assortment in Anaphase I. Which term specifically refers to the gain of extra chromosome sets from individuals of the same species? Which of the following statements about mitosis is not true? What is the probable evolutionary mechanism for this occurring? Aneuploidy is a change in the number of chromosomes resulting from nondisjunction during meiosis. D) They will have a haploid and diploid phase of the life cycle. 8 C. 12 D. 16 E. 24. CompetingSpecies\text{\red{Competing Species}}CompetingSpecies A Lotka-Volterra model in which two species compete for the same source of food (as in Exercise 9) can be described by the system of differential equations, dx1dt=r1x1(1x1k1b1x2k1)dx2dt=r2x2(1x2k2b2x1k2).\begin{aligned} A. C) providing genetic variation in sexually reproducing organisms. A. If a sperm cell contains 8 chromosomes, it comes from an animal that has ______ chromosomes. C) immediately after the sperm penetrates the primary oocyte body parts being shaped and patterned into a specific form. All of these events occur only in meiosis I, never in mitosis. The cell formed after fertilization of an egg by a sperm is called a(n). Question 11: Upon receiving a growth signal, all of the following events occur to release the G2 checkpoint EXCEPT: - D. cyclin - CDK enters the nucleus. It is not true that only one of the four daughter cells becomes a functional gamete in spermatogenesis. 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