Question

question 1
2 pts
match each correct statement to the set of alleles listed below.
recessive homozygous for an autosomal gene
heterozygous for an autosomal gene
dominant homozygous for an autosomal gene
male affected by recessive sex - linked disease
female carrier of a sex - linked disease
choose
xay
xaxa
xay
bb
xaxa
bb
bb

Explanation:

1. For an autosomal gene, a recessive - homozygous individual has two recessive alleles. So, for an autosomal gene, the recessive - homozygous genotype is bb.
2. A heterozygous individual for an autosomal gene has one dominant and one recessive allele. So, for an autosomal gene, the heterozygous genotype is Bb.
3. A dominant - homozygous individual for an autosomal gene has two dominant alleles. So, for an autosomal gene, the dominant - homozygous genotype is BB.
4. In sex - linked inheritance, males have one X and one Y chromosome. A male affected by a recessive sex - linked disease has the recessive allele on his X chromosome, so the genotype is XaY.
5. A female carrier of a sex - linked disease has one normal and one recessive allele on her X chromosomes, so the genotype is XAXa.

Answer:

recessive homozygous for an autosomal gene: bb
heterozygous for an autosomal gene: Bb
dominant homozygous for an autosomal gene: BB
male affected by recessive sex - linked disease: XaY
female carrier of a sex - linked disease: XAXa