13 Jun What will the genotype of these yellow offspring
Question
31. What will the genotype of these yellow offspring be?
A) GG
B) Gg
C) gg
D) Yellow offspring can be either GG or Gg.
32. What proportion of the mice in the litter will be gray?
A) 1/4 (25%)
B) 1/3 (33%)
C) 2/3 (67%)
D) 3/4 (75%)
33. Genetics Problems – Problem II. The ichthyoses are a family of genetic skin diseases characterized by excessively dry, thickened, scaling skin. Ichthyosis, often called “fish scale” disease, is disfiguring, often disabling and in some cases life threatening. The most common type of ichthyosis affects approximately one of every 6000 people and is inherited as a sex-linked recessive disorder in humans. A woman with normal skin who is a carrier of the ichthyosis allele (f) marries a man who has normal skin (F). Based upon this information, construct a Punnett Square, then answer the questions that follow. What is the probability that they will have a child with ichthyosis?
A) 25% (1/4)
B) 50% (1/2)
C) 75% (3/4)
D) 100%
34. The woman becomes pregnant and has a karyotype analysis done for her fetus. The couple finds out that the baby is a boy. What is the probability that their son will have ichthyosis?
A) 0%
B) 25% (1/4)
C) 50% (1/2)
D) 100%
35. If the child is a daughter, what is the probability that she will have ichthyosis?
A) O%
B) 25% (1/4)
C) 50% (1/2)
D) 100%
36. What is the probability that they will have a child who has normal skin but is a carrier of the ichthyosis allele?
A) 0%
B) 25% (1/4)
C) 50% (1/2)
D) 75% (3/4)
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