Jake and his brother are affected with red-green color blindness (XLR). Both of
ID: 259192 • Letter: J
Question
Jake and his brother are affected with red-green color blindness (XLR). Both of their parents are unaffected. Which of their grandparents is most likely to be the source of mutation?
maternal grandmother
maternal grandfather
paternal grandmother
paternal grandfather
either grandfather is equally likely
either grandmother is equally likely
either of the maternal grandparents is equally likely
A trait has ONLY 2 distinct phenotypic variations in the population. Which of the following COULD be the cause?
One gene with two codominant alleles is involved.
One gene with two alleles is involved, and the gene has a late phenotypic expression (late onset)
One gene with multiple alleles is involved.
One gene with incomplete dominant alleles is involved.
A.maternal grandmother
B.maternal grandfather
C.paternal grandmother
D.paternal grandfather
E.either grandfather is equally likely
F.either grandmother is equally likely
G.either of the maternal grandparents is equally likely
Explanation / Answer
1-G
2- B
Note- both incomplete or codominance show more than two phenotypic variance which is due to either both allele are dominant or either allelre is completely dominant over other.
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