_________________________________________________________ A trihybrid cross AA B
ID: 34285 • Letter: #
Question
_________________________________________________________ A trihybrid cross AA BB rr X aa bb RR is made in a plant species in which A and B are completely dominant to a and b, but there is incomplete dominance beteen R and r. Assuming independent assortment, consider the F2 progeny from this cross. 3) How many different phenotypic classes will there be in the F2 progeny? a) 3 b) 4 c) 8 d) 9 e) 12 4) What is the probability of getting back out the parental aa bb RR genotype? a) 1/8 b) 1/9 c) 1/16 d) 1/32 e) 1/64 _________________________________________________________ A trihybrid cross AA BB rr X aa bb RR is made in a plant species in which A and B are completely dominant to a and b, but there is incomplete dominance beteen R and r. Assuming independent assortment, consider the F2 progeny from this cross. 3) How many different phenotypic classes will there be in the F2 progeny? a) 3 b) 4 c) 8 d) 9 e) 12 4) What is the probability of getting back out the parental aa bb RR genotype? a) 1/8 b) 1/9 c) 1/16 d) 1/32 e) 1/64 _________________________________________________________ A trihybrid cross AA BB rr X aa bb RR is made in a plant species in which A and B are completely dominant to a and b, but there is incomplete dominance beteen R and r. Assuming independent assortment, consider the F2 progeny from this cross. 3) How many different phenotypic classes will there be in the F2 progeny? a) 3 b) 4 c) 8 d) 9 e) 12 4) What is the probability of getting back out the parental aa bb RR genotype? a) 1/8 b) 1/9 c) 1/16 d) 1/32 e) 1/64Explanation / Answer
3)
A trihybrid cross AA BB rr X aa bb RR is made in a plant species in which A and B are completely dominant to a and b, but there is incomplete dominance beteen R and r. The offspring may contain Aa Bb and Rr phenotypes. The heterozygotes does not affect the phenotype of organisms.
Hence option a is correct.
4)
The probability of getting back out the parental aa bb RR genotype is as follows
The cross between Aa x Aa results in aa offspring is 1/4
The cross betweenBb x Bb results in bb offspring is 1/4
The cross between Rr x Rr results in RR offspring is 1/4
Hence probability of getting back out the parental aa bb RR genotype is = 1/4 x1/4 x 1/4 = 1/64.
Option e is correct.
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