10 Jun In humans, cataracts in the eyes and fragility of the bones
Question
In humans, cataracts in the eyes and fragility of the bones are caused by dominant alleles that assort independently. A man with cataracts and normal bones marries a woman without cataracts but with fragile bones. The man’s father had normal eyes, and the woman’s father had normal bones.
a. Define letter symbols for the alleles of each of the two genes in the problem. Do not choose letters that have similar upper and lower case letters (such as Cc or Ff).
b. What is the genotype of the man? Briefly explain.
c. What is the genotype of the woman? Briefly explain.
d. Show the genotypic and phenotypic proportions that would be seen in the offspring from this couple. Show a Punnett square as part of your answer.
Assume this couple has 2 children:
e. What is the probability that only the second child is completely normal?
f. What is the probability that none of the children has cataracts?
g. What is the probability that the one of the children is child is a boy with cataracts and normal bones and one of the children is a girl with normal eyes and normal bones?
Assume this couple had 6 children:
h. What is the probability that 5 of the children have both cataracts and normal bones?
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