Select all that apply. Why does meiosis result in more genetic variation than can be explained by mutation alone? because of the segregation of identical sister chromatids in anaphase of meiosis II O because of crossing over between homologs during prophase I Cross over is also called homologous recombination. because not all the DNA gets replicated during S phase because of the random alignment of maternal and paternal homologs during metaphase of meiosis I because of random fertilization.

Select all that apply. Why does meiosis result in more genetic variation than can be explained by mutation alone? because of the segregation of identical sister chromatids in anaphase of meiosis II O because of crossing over between homologs during prophase I Cross over is also called homologous recombination. because not all the DNA gets replicated during S phase because of the random alignment of maternal and paternal homologs during metaphase of meiosis I because of random fertilization.

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter4: Pedigree Analysis In Human Genetics

Section: Chapter Questions

Problem 15QP: Analysis of X-Linked Dominant and Recessive Traits The X and Y chromosomes are structurally and...

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Select true or false for each of the following statements regarding metaphase I. Homologous chromosomes are connected only at the centromeres. Answertruefalse Homologous chromosomes are aligned at the metaphase plate. Answertruefalse The paternal chromosomes are aligned on one side of the metaphase plate and the maternal chromosomes are aligned at the other. Answertruefalse In a cell with 4 chromosome pairs, there are 16 different ways to align the tetrads. Answertruefalse Homologous chromosomes are independently assorted. Answertruefalse
Need help. Knowing that the Curly leaf (Cy) is a dominant gene on chromosome 6, as it is useful in tracking other genes using trisomics for chromosome 6. Assume a Cy Cy cy plant used as a pollen parent where disomic pollen does not function crossed to a Cy cy cy female where disomic eggs do function. A) What ratio would be predicted in the progeny of this cross? B) What if the reciprocal cross was made?
Equalizing the Expression of X Chromosome Genes in Males and Females Individuals with an XXY genotype are sterile males. If one X is inactivated early in embryogenesis, the genotype of the individual effectively becomes XY. Why will this individual not develop as a normal male?
Carbon Copy (CC), the first cat produced from aclone, was created from an ovarian cell taken from hergenetic donor, Rainbow, a calico cat. The diploid nucleusfrom the cell was extracted and then injected into an enucleatedegg. The resulting zygote was then allowed to developin a petri dish, and the cloned embryo was implanted inthe uterus of a surrogate mother cat, who gave birth to CC.CC’s surrogate mother was a tabby (see the photo below).Geneticists were very interested in the outcome of cloninga calico cat because they were not certain if the cloned catwould have patches of orange and black, just orange, orjust black. Taking into account the Lyon hypothesis, explainthe basis of the uncertainty. Would you expect CC to appearidentical to Rainbow? Explain why or why not.
MODIFIED TRUE OR FALSE. In the following items, read each statement carefully. I. In humans and other mammals, biological sex is determined by a pair of sex chromosomes: XX in males and XY in females.II. In the sexual pattern of inheritance, an X-linked pattern will be present and can attached both on the X and Y chromosomes. a. The first statement (I) is correct and the second statement (II) is wrong b. The first statement (I) is wrong and the second statement (II) is correct c. Both statements are correct d. Both statements are wrong MODIFIED TRUE OR FALSE. In the following items, read each statement carefully. I. One important event that happens in Meiosis at Prophase 1 is when crossing over between sister chromatids of non-homologous chromosomes takes place.II. This crossing over is the exchange of genetic material that causes variations among individuals. a. The first statement (I) is correct and the second statement (II) is wrong…
GENETICS In a sexually reproducing diploid organism in which 2n=6, a normal meiocyte in reduction should exhibit a total of 3 bivalents at the metaphase plate. Consider the following organism in the previous statement. if there is no crossing over, the number of possible haploids (gamete) genotypes generated by "chromosome shuffling" during meiosis is _____?
Evidence [see P. G. Shiels, A. J. Kind, K. H. Campbell, et al. (1999),“Analysis of telomere lengths in cloned sheep,” Nature 399, 316–317] suggests that Dolly may have been genetically older than heractual age. As mammals age, the chromosomes in somatic cells tendto shorten from the telomeres. Therefore, older individuals haveshorter chromosomes in their somatic cells than do younger ones.When researchers analyzed the chromosomes in the somatic cells of Dolly when she was about 3 years old, the lengths of her chromosomeswere consistent with those of a sheep that was significantlyolder, say, 9–10 years old. (Note: As described in the chapter, thesheep that donated the somatic cell that produced Dolly was 6 yearsold, and her mammary cells had been grown in culture for severalcell doublings before one of the cells was fused with an oocyte.)A. Suggest an explanation why Dolly’s chromosomes seemedolder than they should have been.B. Let’s suppose that a female sheep (like Dolly), which…
Select the true statements. (can be multiple). Sperm and egg cells are diploid, meaning that they have two copies of the human genome. Somatic cells are haploid, meaning that they have one copy of the human genome. Stem cells are haploid, meaning that they have one copy of the human genome. Somatic cells are diploid, meaning that they have two copies of the human genome.
The centromere Group of answer choices A is a group of proteins that attach to the kinetochore. B is not present on the chromosomes of the daughter cells until anaphase. C is a region of DNA where sister chromatids associate with one another and where the kinetochore forms D is a group of proteins that attach to the mitotic spindle. E is a region of DNA where sister chromatids associate with one another
1. In a plant, green is dominant over white leaf; long is dominant over round shape. a. How many total genotypes are possible in the offsprings of a dihybrid cross? Show the Punnet square. a. Give the phenotypic and genotypic ratios. b. What is the probability of obtaining a plant with white, round shaped leaves? 2. Since eukaryotic chromosomes are assembled with histone proteins, how are replication and transcription carried out? Describe the mechanisms. 3. How are the chromosomes of prokaryotes different from eukaryotes?
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Progeny of triploid tomato plants often contain parts of an extra chromosome, in addition to the normal complement of 24 chromosomes . Mutantswith a part of an extra chromosome are referred to as secondaries. James and Margaret Lesley observed that secondaries arise from triploid (3 n), trisomic (3 n + 1), and double trisomic (3 n + 1 + 1) parents, but never from diploids (2 n). Give one or more possible reasons that secondaries arise from parents that have unpaired chromosomes but not from parents that are normal diploids.