. A woman with Turner syndrome is found to be colorblind (an X-linked recessive phenotype). Both her motherand her father have normal vision.a. Explain the simultaneous origin of Turner syndromeand color blindness by the abnormal behavior ofchromosomes at meiosis.b. Can your explanation distinguish whether theabnormal chromosome behavior occurred in the fatheror the mother?c. Can your explanation distinguish whether theabnormal chromosome behavior occurred at the first orsecond division of meiosis?d. Now assume that a color-blind Klinefelter man hasparents with normal vision, and answer parts a, b, and c.

. A woman with Turner syndrome is found to be colorblind (an X-linked recessive phenotype). Both her motherand her father have normal vision.a. Explain the simultaneous origin of Turner syndromeand color blindness by the abnormal behavior ofchromosomes at meiosis.b. Can your explanation distinguish whether theabnormal chromosome behavior occurred in the fatheror the mother?c. Can your explanation distinguish whether theabnormal chromosome behavior occurred at the first orsecond division of meiosis?d. Now assume that a color-blind Klinefelter man hasparents with normal vision, and answer parts a, b, and c.

Name: . A woman with Turner syndrome is found to be colorblind (an X-linked
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Description: . A woman with Turner syndrome is found to be colorblind (an X-linked recessive phenotype). Both her motherand her father have normal vision.a. Explain the simultaneous origin of Turner syndromeand color blindness by the abnormal behavior ofchromosom

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter14: Human Inheritance

Section: Chapter Questions

Problem 2GP: Human females have two X chromosomes XX; males have one X and one Y chromosome XY. a. With respect...

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A woman with normal chromosomes mates with a man who also has normal chromosomes. a. Suppose that, in the course of oogenesis, the woman’s sex chromosomes undergo nondisjunction in meiosis I; the man’s chromosomes separate normally. Give all possible combinations of sex chromosomes that this couple’s children might inherit and the number of Barr bodies that you would expect to see in each of the cells of each child. b. What chromosome combinations and numbers of Barr bodies would you expect to see if the chromosomes separate normally in oogenesis, but nondisjunction of the sex chromosomes takes place in meiosis I of spermatogenesis?
2) A. Explain how polyribosomes form. B. Why might you expect the insertion of 3 DNA base pairs to be less disruptive than th deletion of a single base pair? C. Compare and contrast mitosis and meiosis with respect to their genetic outcomes? D. What are the possible consequences of non-disjunction during cell division? E. How does meiosis increase genetic diversity in populations?
. Researchers discovered recently that the sole functionof the SRY protein is to activate an autosomal genecalled Sox9 in the presumptive gonad (before it has“decided” to become a testis or an ovary).a. What would be the sex of an XY individual homozygous for nonfunctional mutant alleles of Sox9?Explain.
Human females have two X chromosomes XX; males have one X and one Y chromosome XY. a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. A female homozygous for an X-linked allele can produce how many types of gametes with respect to that allele? c. A female heterozygous for an X-linked allele can produce how many types of gametes with respect to that allele?
Assume that a meiotic-nondisjunction event causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are absolutely identical, at what point during meiosis did the nondisjunction event take place?
a. If a set of chromosomes is one copy of each kind of chromosome, how many sets are in a human sperm_____. How many chromosomes are in a human sperm____. b. How many sets of chromosomes are in a human egg_____. How many chromosomes are in a human egg_____. c. Why is there such a different in size and number of sperm cells in the testes compared to the number of oocytes in the ovaries ?
a. If cell division during gametogenesis is non-meiotic, what is its consequence to the future generations of diploid organisms? b. How does non-disjunction in meiosis lead to numerical chromosomal aberration?
Represent the segregation of chromosomes during Meiosis 1 and Meiosis 2 a.) normal segregation in male b.) abnormal segregation in female Make use of circles as representing cells undergoing the above processes. Inside the circles are the chromosome number of the male or the female.
STUDY GUIDE Name a A HUMAN TRAITS In your textbook, read about color blindness in Section 27:2. 1. Color blindness is a trait carried on the sex chromosomes. Let C be normal color vision and c b red-green color blindness. Use the diagrams to answer the questions. a. What is the sex of each of these people? Write either male or female on the blank below each. XX XX X Xa XX C b. Which are red-green color blind? c. Which have normal color vision? X X XXXXX B ①① X X XXXXX M a XaXa Date a d. Which has normal color vision even with the gene for color blindness? 2. a. Complete the following Punnett squares. The first one has been done for you. b. Using these colors, shade the following parts of the Punnett squares. Blue-normal females Yellow-normal males Red-color blind females Green-color blind males X X XXXXX Class D CHAPTER 27 X X XXXXX a Xalo E X X X×××× X oooolgolma 8 X X XXXXX a X a Xa 15 1
An organism has two chromosomes only. Chromosome 1 has its centromere near one end and carries the A-locus. Chromosome 2 has its centromere at the centre and carries the B-locus. Consider a heterozygous with alleles A and B inherited from one parent and alleles a and b from the other parent. What does the following figure represent? a. Metaphase of meiosis I b. Metaphase of meiosis II c. Metaphase of mitosis d. Metaphase of mitosis or meiosis II
The maternal-effect mutation bicoid (bcd) is recessive. Inthe absence of the bicoid protein product, embryogenesis isnot completed. Consider a cross between a female heterozygousfor the bicoid mutation (bcd+/ bcd-) and a homozygousmale(bcd-/ bcd-). How is it possible for a male homozygous for the mutationto exist?
a. What type of cell division mitosis, meiosis I or meiosis II is shown in this figure? b. What is the diploid number of this organism? c. Provide labels for (i) and (ii)