Multiple Choice
In a dihybrid cross in corn where both parents have the genotype ppss, what is the expected phenotypic ratio among the offspring?
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2. Mendel's Laws of Inheritance
Dihybrid Cross
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Two organisms with the genotypes Aa bb Cc Dd Ee and Aa Bb Cc dd Ee were crossed. Use the branch method to determine the proportion of the following genotypes in the offspring. I. aa bb cc dd ee
A
1/256
B
1/64
C
1/16
D
1/4
Verified step by step guidance1
Identify the genotypes of each parent for each gene locus. Parent 1 has Aa bb Cc Dd Ee and Parent 2 has Aa Bb Cc dd Ee.
Determine the possible gametes for each gene locus separately using the branch method. For example, for the 'A' locus, both parents can produce gametes with 'A' or 'a'.
Calculate the probability of each offspring genotype by multiplying the probabilities of inheriting each allele from the parents. For example, the probability of 'aa' is the product of the probabilities of inheriting 'a' from both parents.
Repeat the process for each gene locus ('b', 'c', 'd', 'e') to find the probability of the offspring having the genotype 'aa bb cc dd ee'.
Multiply the probabilities obtained for each locus to find the overall probability of the offspring having the genotype 'aa bb cc dd ee'.
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