Can someone please explain how to solve this problem for me? Height in humans de

Question

Can someone please explain how to solve this problem for me?

Height in humans depends on additive action of genes. Assume that this trait is controlled by four loci, where each additive allele adds 2 inches and the environmental effects are negligible. In the families surveyed, the minimum height is 60 inches. a. How tall are the children expected in the marriage between a male 60 inches tall and a female 64 inches tall? b. What is the maximum height of the individual when all additive alleles are present in his genome?

Explanation / Answer

minimum height = 60 inches number of alleles = 4 each additive allele adds = 2 inches x 4 = 8 inches male = 60 inches and female = 64 inches mean = 60 +64/2 =124/2 =61 inches AABBCCDD = 2+2+2+2+2+2+2+2 = 16 AABBCCDd = 2+2+2+2+2+2+2 = 14 AABBCCdd = 2+2+2+2+2+2 = 12 AABBCcdd = 2+2+2+2+2 = 10 AABBccdd = 2+2+2+2 = 8 AABbccdd =6 AAbbccdd =4 Aabbccdd =2 aabbccdd =0 mean height = 61 inches F1 has AaBbCcDd or 4 additive alleles = 61 +8 = 67 F2 will be .....61, 61+12,61+10,61+8,61+6,61+4,61+2,61+0 maximum height of the individual when all the additive alleles have been present = 73 inches

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