Genetics Prac Prob #6 Sex-linked
Genetics Practice Problems– Sex Linkage Worksheet
1. A normal female marries a color blind male. Complete the cross using a punnett square then answer the following questions.
(A) What are the chances that the offspring will be color blind if they are females?
(B) What are the chances that the offspring will be color blind if they are males?
2. A color-blind female marries a normal male. Complete the cross using a punnett square then answer the following question.
(A) How many of the female offspring will be carries of the color-blind allele?
3. A carrier female marries a normal male. Complete the cross using a punnett square then answer the following questions.
(A) How many of the male offspring can be expected to be color-blind?
(B) How many of the male offspring can be expected to have normal vision?
(C) How many of the female offspring can be expected to be carriers?
(D) How many of the female offspring can be expected to be normal?
4. Hemophilia is an X-linked, recessive disorder. A hemophilic male marries a woman who is heterozygous. Complete the cross using a punnett square then answer the following questions.
(A) What percentage of their sons will be hemophilic?
(B) What percentage of their daughters will be hemophilic?
5. Using what you have learned from the above crosses explain why males are more likely to have an X-linked disorder then females.
6. Using what you have learned from the above crosses explain why the mother is the only one that can give the X-linked trait to the son. Also explain why she can pass on the trait and not even know that she has the disorder.
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