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a) Describe the sex and characteristics of the person labeled A. (1 point)
b) Describe the genotype of the person labeled B. (1 point)
c) Describe the genotype of the person labeled C. (1 point)
a) Describe the sex and characteristics of the person labeled A. (1 point)
b) Describe the genotype of the person labeled B. (1 point)
c) Describe the genotype of the person labeled C. (1 point)
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Let's look at the diagram.
You can see in generation III that this is not an X-linked recessive disease -- if it were, then the girl in that generation would not be afflicted since her dad isn't.
Similarly, since a girl is afflicted, it's not Y-linked.
It could be X-linked dominant.
It could be autosomal dominant
It could be autosomal recessive
We can't distinguish these three from this diagram.
a) Describe the sex and characteristics of the person labeled A. (1 point)
Affected male (afflicted)
b) Describe the genotype of the person labeled B. (1 point)
Affected (afflicted) female.
I can't tell the genotype without more information.
X-linked dominant: this individual is heterozygous
autosomal dominant: this individual is heterozygous
autosomal recessive: this individual is homozygous
c) Describe the genotype of the person labeled C. (1 point)
Unaffected male.
I can't tell the genotype without more information.
X-linked dominant: this individual is completely normal
autosomal dominant: this individual is completely normal
autosomal recessive: this individual is a carrier -- heterozygous
You can see in generation III that this is not an X-linked recessive disease -- if it were, then the girl in that generation would not be afflicted since her dad isn't.
Similarly, since a girl is afflicted, it's not Y-linked.
It could be X-linked dominant.
It could be autosomal dominant
It could be autosomal recessive
We can't distinguish these three from this diagram.
a) Describe the sex and characteristics of the person labeled A. (1 point)
Affected male (afflicted)
b) Describe the genotype of the person labeled B. (1 point)
Affected (afflicted) female.
I can't tell the genotype without more information.
X-linked dominant: this individual is heterozygous
autosomal dominant: this individual is heterozygous
autosomal recessive: this individual is homozygous
c) Describe the genotype of the person labeled C. (1 point)
Unaffected male.
I can't tell the genotype without more information.
X-linked dominant: this individual is completely normal
autosomal dominant: this individual is completely normal
autosomal recessive: this individual is a carrier -- heterozygous