Flies and mammals use an XY chromosomal system of sex determination. Therefore, the mechanism to compensate for the higher gene dose on the two X-chromosomes in females compared to one X-chromosome in males is identical in both groups of animals! True False

Flies and mammals use an XY chromosomal system of sex determination. Therefore, the mechanism to compensate for the higher gene dose on the two X-chromosomes in females compared to one X-chromosome in males is identical in both groups of animals! True False

Name: Flies and mammals use an XY chromosomal system of sexdetermination. T
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Description: Flies and mammals use an XY chromosomal system of sexdetermination. Therefore, the mechanism to compensate for thehigher gene dose on the two X-chromosomes in females comparedto one X-chromosome in males is identical in both groups ofanimals!TrueFal

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter7: Development And Sex Determination

Section: Chapter Questions

Problem 16QP

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The Y chromosome has been shrinking throughout mammalian evolution, but many of its remaining genes play crucial roles beyond sex determination. Let's discuss the implications. And keep in mind that many animal species do not even have proper sex chromosomes.
Generally, sex chromosomes in male mammals are XY and females are XX. Followingmeiosis and gamete production, and assuming there are no chromosome mutations, what is thefrequency of the genotypes of all possible gametes, and what should be the sex ratio of alloffspring produced within a population?
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In certain salamanders, the sex of a genetic female can be altered, changing her into a functional male; these salamanders are called sexreversed males. When a sex-reversed male is mated with a normal female, approximately 23 of the offspring are female and 13 are male. How is sex determined in these salamanders? Explain the results of this cross.
Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement of 46 chromosomes plus one (extra) chromosome #21. Such individuals therefore have 47 chromosomes. Assume that a mating occurs between a female with Down syndrome and a normal 46-chromosome male. What proportion of the offspring would be expected to have Down syndrome? Justify your answer.
Assuming that such a fly would be viable, what would be the sexof a fruit fly with the following chromosomal composition?A. One X chromosome and two sets of autosomesB. Two X chromosomes, one Y chromosome, and two sets ofautosomesC. Two X chromosomes and four sets of autosomesD. Four X chromosomes, two Y chromosomes, and four sets ofautosomes
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A system of sex determination known as haplodiploidy is found in honeybees. Females are diploid, andmales (drones) are haploid. Male offspring resultfrom the development of unfertilized eggs. Sperm areproduced by mitosis in males and fertilize eggs in thefemales. Ivory eye is a recessive characteristic inhoneybees; wild-type eyes are brown.a. What progeny would result from an ivory-eyedqueen and a brown-eyed drone? Give both genotype and phenotype for progeny produced fromfertilized and nonfertilized eggs.b. What would result from crossing a daughter fromthe mating in part (a) with a brown-eyed drone?