1. Nicole Johnson is an albino, a condition inherited by a recessive allele (a).
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Question
1. Nicole Johnson is an albino, a condition inherited by a recessive allele (a). She's marrying a man with normal skin color, whose father was an albino. Nicole makes an appointment for genetic counseling because she wants to evaluate the risk of passing her condition on to her children. What is the probability that a child from this marriage will be an albino? Show your work.
2. In humans, assume that brown eyes (B) are dominant over blue eyes (b). A blueeyed man whose father was brown eyed and whose mother was blue eyed marries a brown-eyed woman whose father had brown eyes and whose mother had blue eyes. What are the genotypes of all the individuals? Show your work. blue-eyed man ____ _ brown-eyed woman _ _ _ _ _ _ _ his father ______ _ her father _ _________ _ his mother _ _____ _ her mother _ _ ___ _ _ __ ~ What is the probability that this couple will have a blue-eyed child? ___ _ What is the probability of a brown-eyed child?-- --------
3. Polydactyly (extra fingers or toes) is inherited by a dominant allele (F). A father is polydactyl, the mother has the normal number of fingers, and they have had one normal child. What are the genotypes of all the individuals involved? What is the probability that a second child will have a normal number of fingers? Show your work. the father ____ _ the mother ___ _ the first child ___ _ probability of a child with five fingers ___ _
4. Assume that the baby you made in Activity 5 has wavy hair, inherited through incomplete dominance (Hh) and grows up to marry a person who also has wavy hair. What is the probability you'll have grandchildren with straight hair? ____ _ Curly hair? ____ _ Wavy hair? ____ _
Show your work.
Explanation / Answer
Based on the given data,
1)
Albinism is autosomal recessive inheritance disorder. For example, consider
Thus, the disease occur only individuals with “aa” genotype.
Here, Nicole Johnson is an albino, so her genotype is: “aa”
The husbands genotype I either AA or Aa, it is based on his mother genotypic condition. If her husband mother is Aa, then
Thus, probability that a child from this marriage will be an albino is 1/2 or 0.5.
If her husband mother is AA, then
Thus, probability that a child from this marriage will be an albino is 1/2 or 0.5.
In Both conditions Nicole husband genotype is Aa, and he does not have the disease (carrier).
2)
The genes of eyes:
Here, brown eyes are dominant over blue eyes, so the genotypes, which express
Thus,
Blue-eyed man bb brown-eyed woman Bb his father Bb her father BB his mother bb her mother bb.
Thus, the probability that this couple will have a blue-eyed child is 1/4 or 0.25 and probability of a brown-eyed child is 3/4 or 0.75.
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