In the parental cross AABBCCDDEEFFGG x aabbccddeeffgg, where the capital letter

Question

In the parental cross AABBCCDDEEFFGG x aabbccddeeffgg, where the capital letter represents the dominant allele in each of the seven independently assorting bones how many different genotypes would be expected in the F2? What proportion of the F2 offspring will show the dominant phenotype for all seven traits? What proportion of the F2 offspring will show the dominant phenotype for the vowels only? What proportion of those in (c) will be heterozygous for both of the vowel traits? Now assume that each trait expressed in the heterozygous form will show codominance what proportion of the F2 offspring will show the codominant phenotype for all seven traits?

Explanation / Answer

a) 2187 f2 results: 3 different genotypes for each of the 7. 3 to the 7th power b) (2187/16384) or about 13 per cent--(3/4) to the 7th, each is an "and" condition) c) (9/16384) =(3/4)(3/4)(1/4 to the 5th) d) 4/9 of that proportion (2/3 and 2/3) e) 1/128 (1/2 to the 7th)

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