An organism having the genotype AaBbCcDdEe is self-fertilized. Assuming the loci

Question

An organism having the genotype AaBbCcDdEe is self-fertilized. Assuming the loci assort independently, determine the following proportions:

Part A: gametes that are expected to carry only recessive alleles.
Express your answer using three decimal places.

Part B: progeny that are expected to have a genotype identical to that of the parent.
Express your answer using three decimal places.

Part C: progeny that are expected to have a phenotype identical to that of the parent.
Express your answer using three decimal places.

Part D: gametes that are expected to be abCDE .

Part E: progeny that are expected to have the genotype AabbCcDcE_ .
Express your answer using three decimal places.

Explanation / Answer

The probability of occurrence of a recessive allele is ½. There are five recessive alleles and probability of gametes with all recessive alleles is 1/(2)5 = 1/32 = 0.031

Genotype identical to that of parents = (1/4)5 = 0.001

Progeny with phenotype identical to that of parent: If the genotype of A allele is considered, the probability of AA is ¼ and that of Aa is ½. Combined, the probability of these two genotypes is ¾. These two genotypes are phenotypically identical to the parent. Hence, the overall probability is (3/4)5 = 0.237

Gametes with the genotype abCDE = (1/2)5 = 0.001

Probability of Aa = ½. Probability of bb = ¼. Probability of Cc = ½. Probability of D_ is ¾. Probability of E_ is ¾. Therefore, the overall probability is½*1/4*1/2*3/4*3/4 = 0.035

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