a) What is the largest number of differentoffspring genotypes that could possibl

Question

a) What is the largest number of differentoffspring genotypes that could possibly result if you crossedtwo parents of the same genotype below AA Bb Cc dd x   Aa bb CCDD b)If you crossed two parents of differinggenotype What is the new number Here (differing meandifferent at all 4 genes) Please explain your answer a) What is the largest number of differentoffspring genotypes that could possibly result if you crossedtwo parents of the same genotype below AA Bb Cc dd x   Aa bb CCDD b)If you crossed two parents of differinggenotype What is the new number Here (differing meandifferent at all 4 genes) Please explain your answer AA Bb Cc dd x   Aa bb CCDD b)If you crossed two parents of differinggenotype What is the new number Here (differing meandifferent at all 4 genes) Please explain your answer

Explanation / Answer

A can be either AA or Aa (2 possibilities) B can be either Bb or bb (2) C can be either CC or cC (2) D must be dD (1)
so, the number of different offspring is 2 x 2 x 2 x 1 =8
b) Since the parents must have different genotypes, atleast one must be homogenous for each gene. If both werehetro, they would be the same. So, for the A gene, we have AAcrossing with Aa, or aa crossing with Aa, or AA crossing with aa. For the first cross, AA crossed with Aa can yield only Aa orAA, which matches one parent or the other. Same for thesecond cross. The third cross can only be Aa, which doesn'tmatch either parent.
The same arguement holds for the other 3 genes.
Start with the case of this:
AA BB CC DD cross with aa bb cc dd - there is one outcome, andit is different. It doesn't matter which parent has the capsas long as all genes are homo, they will give the same result,offspring that is hetro in all genes, and different from bothparents in all genes.
Now, let's introduce one hetro gene in A in one parent
Aa BB cc DD crossed with AA bb CC dd: The answerwill be different from one parent in all four genes, but not both. I think this does not count as meeting the definition ofdifferent above.
Same for hetro in B, C, or D alone or in any combo.
So, the answer is that there is only one offspring that isdifferent in all four genes from both parents. It will alwaysbe Aa Bb Cc Dd.
I'm not 100% that I've interpreted the question correctly.

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