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13.02.2020 •
Biology
A, B, D, R, T are genes located on 5 different chromosomes. In all cases, the capital letter allele is dominant to lower case allele (i.e. A is dominant to a). In the following cross: AaBbDdRrTt (1st parent) x AabbDdrrTT (2nd parent) What fraction of progeny will genotypically resemble the 2nd parent?
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Ответ:
Overall fraction of progeny that will genotypically resemble the second parent (AabbDdrrTT) = 1/32
Explanation:
We can calculate the fraction of progeny that will resemble the second parent by drawing a square diagram for each of the given parent genes separately and then multiplying the required gene fractions together.
First Parent = AaBbDdRrTt
Second Parent = AabbDdrrTT
Parent Alleles A a
A AA Aa
a Aa aa
The progeny resembling the second parent genotype (Aa) = 2/4 = 1/2
Parent Alleles B b
b Bb bb
b Bb bb
The progeny resembling the second parent genotype (bb) = 2/4 = 1/2
Parent Alleles D d
D DD Dd
d Dd dd
The progeny resembling the second parent genotype (Dd) = 2/4 = 1/2
Parent Alleles R r
r Rr rr
r Rr rr
The progeny resembling the second parent genotype (rr) = 2/4 = 1/2
Parent Alleles T t
T TT Tt
T TT Tt
The progeny resembling the second parent genotype (TT) = 2/4 = 1/2
Overall fraction of progeny that will genotypically resemble the second parent (AabbDdrrTT) = 1/2 x 1/2 x 1/2 x 1/2 x 1/2 = 1/32
Ответ:
Animals,Bacteria,plants,fungi
Explanation: