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SEX DETERMINATION
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1. What is the difference between an X and a Z chromosome 2. Transformer (tra) is an autosomal recessive gene that converts chromosomal females into sterile males. A female Drosophila heterozygous for the transformer allele (tra) is mated with a normal male homozygous for transformer. What is the sex ratio of their offspring What is the sex ratio of their offspring s offspring
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3. The autosomal recessive doublesex (dsx) gene converts males and females into developmental intersexes. Two fruit ies, both heterozygous for the doublesex (dsx) allele, are mated. What are the sexes of their offspring 4. What is a sex switch What genes serve as sex switches in human beings and Drosophila
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*Answers to selected exercises and problems are on page A-4.
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Tamarin: Principles of Genetics, Seventh Edition
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II. Mendelism and the Chromosomal Theory
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5. Sex Determination, Sex Linkage, and Pedigree Analysis
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The McGraw Hill Companies, 2001
Exercises and Problems
DOSAGE COMPENSATION
5. The diagram of an electrophoretic gel in gure 3 shows activity for a particular enzyme. Lane 1 is a sample from a fast homozygote. Lane 2 is a sample from a slow homozygote. In lane 3, the blood from the rst two was mixed. Lane 4 comes from one of the children of the two homozygotes.
1 2 3 4
11. What family history of hemophilia would indicate to you that a newborn male baby should be exempted from circumcision 12. What is the difference between pseudodominance and phenocopy 13. In Drosophila, cut wings are controlled by a recessive sex-linked allele (ct), and fuzzy body is controlled by a recessive autosomal allele ( fy). When a fuzzy female is mated with a cut male, all the members of the F1 generation are wild-type. What are the proportions of F2 phenotypes, by sex 14. Consider the following crosses in canaries:
Parents a. pink-eyed female pink-eyed male b. pink-eyed female black-eyed male c. black-eyed female pink-eyed male Progeny all pink-eyed all black-eyed all females pink-eyed, all males black-eyed
The activity of a particular enzyme as revealed on an electrophoretic gel.
Can you guess the structure of the enzyme If this were an X-linked trait, what pattern would you expect from a heterozygous female s a. whole blood b. individual cells 6. How many different zones of activity (bands) would you see on a gel stained for lactate dehydrogenase (LDH) activity from a person homozygous for the A protein gene but heterozygous for the B protein gene Are the bands due to the activity of allozymes or isozymes 7. How many Barr bodies would you see in the nuclei of persons with the following sex chromosomes a. X0 e. XXX b. XX f. XXXXX c. XY g. XX/XY mosaic d. XXY What would the sex of each of these persons be If these were the sex chromosomes of individual Drosophila that were diploid for all other chromosomes, what would their sexes be 8. Calico cats have large patches of colored fur. What does this indicate about the age of onset of Lyonization (is it early or late) Tortoiseshell cats have very small color patches. Explain the difference between the two phenotypes.
SEX LINKAGE
Explain these results by determining which allele is dominant and how eye color is inherited. 15. Consider the following crosses involving yellow and gray true-breeding Drosophila:
Cross gray female yellow male yellow female gray male F1 all males gray, all females gray all females gray, all males yellow F2 97 gray females, 42 yellow males, 48 gray males
9. In Drosophila, the lozenge phenotype, caused by a sex-linked recessive allele (lz), is narrow eyes. Diagram to the F2 generation a cross of a lozenge male and a homozygous normal female. Diagram the reciprocal cross. 10. Sex linkage was originally detected in 1906 in moths with a ZW sex-determining mechanism. In the currant moth, a pale color ( p) is recessive to the wildtype and located on the Z chromosome. Diagram reciprocal crosses to the F2 generation in these moths.
a. Is color controlled by an autosomal or an X-linked gene b. Which allele, gray or yellow, is dominant c. Assume 100 F2 offspring are produced in the second cross. What kinds and what numbers of progeny do you expect List males and females separately. 16. A man with brown teeth mates with a woman with normal white teeth. They have four daughters, all with brown teeth, and three sons, all with white teeth. The sons all mate with women with white teeth, and all their children have white teeth. One of the daughters (A) mates with a man with white teeth (B), and they have two brown-toothed daughters, one white-toothed daughter, one browntoothed son, and one white-toothed son. a. Explain these observations. b. Based on your answer to a, what is the chance that the next child of the A-B couple will have brown teeth 17. In human beings, red-green color blindness is inherited as an X-linked recessive trait. A woman with normal vision whose father was color-blind marries a man with normal vision whose father was also color-
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