D
deleted783484
Hi! Would appreciate any help
I picked A but the answer is B and it doesn't make sense to me..
Why can't both parents be heterozygous for the disease and so it's a recessive disease and if the child gets both recessive copies then he's affected?
Their explanation is:
"Both the father and mother have cholesterol levels of 3.0 mg/mL, which is in the
moderately affected range. This suggests they have one copy of the HC gene and one
copy of the normal (wild-type) gene and that the two versions of the gene (alleles) are codominant.
When a gene is recessive, its effect (or lack of effect) is masked by a
corresponding dominant gene. The child has a cholesterol level of 7.0 mg/mL. This is in
the severely affected range according to the passage. This child appears to have acquired
one HC gene from each parent for a total complement of two HC genes and no normal
genes. This is consistent with the idea that the normal and HC genes are co-dominant.
Therefore, the best answer is answer choice B."
@aldol16
I picked A but the answer is B and it doesn't make sense to me..
Why can't both parents be heterozygous for the disease and so it's a recessive disease and if the child gets both recessive copies then he's affected?
Their explanation is:
"Both the father and mother have cholesterol levels of 3.0 mg/mL, which is in the
moderately affected range. This suggests they have one copy of the HC gene and one
copy of the normal (wild-type) gene and that the two versions of the gene (alleles) are codominant.
When a gene is recessive, its effect (or lack of effect) is masked by a
corresponding dominant gene. The child has a cholesterol level of 7.0 mg/mL. This is in
the severely affected range according to the passage. This child appears to have acquired
one HC gene from each parent for a total complement of two HC genes and no normal
genes. This is consistent with the idea that the normal and HC genes are co-dominant.
Therefore, the best answer is answer choice B."
@aldol16