In Drosophila, yellow body color is due to an X-linked gene that isrecessive to the gene for gray body color. [Courtesy Dr. Masa-Toshi Yamamoto, Drosophila Genetic Resource Center, Kyoto Institute ofTechnology.)a. A homozygous gray female is crossed with a yellow male. The F, areintercrossed to produce the F2. Give the genotypes and phenotypes, alongwith the expected proportions, of the F, and F2 progeny.b. A yellow female is crossed with a gray male. The F1 are intercrossed toproduce the F2. Give the genotypes and phenotypes, along with theexpected proportions, of the F1 and F2 progeny.c. A yellow female is crossed with a gray male. The F females arebackcrossed with gray males. Give the genotypes and phenotypes, alongwith the expected proportions, of the F2 progeny.d. If the F2 flies in part b mate randomly, what are the expectedphenotypes and proportions of flies in the F3?

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Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter9: Patterns Of Inheritance

Section: Chapter Questions

Problem 4CT

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Hemophilia is another example of an X-linked disease caused when a recessive allele (Xh) is expressed. If a normal male reproduces with a heterozygous normal female, what are the expected genotypes and phenotypes? Will any of their daughters develop hemophilia?
Colorblindness is an X-linked trait found in humans. What are the chances that a colorblind man will pass it on to his son? Please explain.
. In humans, hemophilia is an X-linked recessive gene and will only be expressed in females if they are homozygous for this gene. However, in some rare cases, a heterozygote becomes hemophilic. Explain how this incident happens and why will there be skewed X-inactivation?
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Why does the sex chromosome X carry the gene for eye color in Drosophila?
If a gene is X-linked, explain why the recessive phenotype would be more often seen in males then in females. Also explain what the term “carrier” means related to these traits.
Number of FEMALE offspring that would have the condition of an X-linked trait, if an affected man and a carrier woman had children
cross a wild female with a male that has white eyes and a tan body. recall from the exercise that both of these traits are x-linked traits.
Hemophilia is another example of a X-linked disease caused when a recessive allele (Xh) is expressed. If a normal male reproduces with a heterozygous normal female, what are the expected genotypes and phenotypes? Will any of their daughters develop hemophilia? As in the previous question, you must also give the gender of the child in your genotype and phenotype descriptions here.
Drosophila, yellow body color is due to an X-linked gene that is recessive to the gene for gray body color.a. A homozygous gray female is crossed with a yellow male. The F1 are intercrossed to produce the F2. Give the genotypes and phenotypes, along with the expected proportions, of the F1 and F2 progeny.b. A yellow female is crossed with a gray male. The F1 are intercrossed to produce the F2. Give the genotypes and phenotypes, along with the expected proportions, of the F1 and F2 progeny.c. A yellow female is crossed with a gray male. The F1 females are backcrossed with gray males. Give the genotypes and phenotypes, along with the expected proportions, of the F2 progeny.d. If the F2 flies in part b mate randomly, what are the expected phenotypes and proportions of flies in the F3?

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