A strain of rhesus monkeys is brachyphalangic (that is, it has veryshort fingers
ID: 4752 • Letter: A
Question
A strain of rhesus monkeys is brachyphalangic (that is, it has veryshort fingers). A monkey breeder wanted to create a true-breedingstrain of brachyphalangic monkeys. To do this, he crossedbrachyphalangic monkeys with one another for several generations.Frustratingly, his crosses always produced mixtures ofbrachyphalangic and normal-finger offspring. Combining the resultsof all the matings, he observed a total of 162 brachyphalangicoffspring and 79 normal-finger offspring. Assuming that fingerlength is determined by a single gene with two alleles, how can youexplain these results? In your answer, use correct notation of yourown choice to indicate the genotypes of the brachyphalangic parentsand their brachyphalangic and normal-finger offspring. Also givethe expected phenotype for heterozygotes and both kinds ofhomozygote.Explanation / Answer
It is just 3:1 ratio
B –DOMINAT trait b-recessive trait
b allele=normal B-abnormal allele- brachyphalangic
Bb x Bb
B
b
BB
BB brachyphalangic
Bb brachyphalangic
b
bB brachyphalangic
bb normal
B
b
BB
BB brachyphalangic
Bb brachyphalangic
b
bB brachyphalangic
bb normal
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