If the parent or offspring genotypes or phenotypes are known, the pattern of inheritance can be predicted. Two organisms, with genotypes BbDD and BBDd, are mated. Assuming independent assortment of the two loci, which of the following genotypic ratios in offspring would occur?
A) 1 BBDD: 1 bbdd
B) 1BBDD: 1 BbDD: 1 BBDd: 1 BbDd
C) 9 BBDD: 3 BbDD: 3 BBDd: 1 bbdd
D) 1 BBDD: 2 BbDd: 1bbdd

Question

Quizplus · Accepted Answer

The correct genotypic ratio for the offspring of the cross between BbDD and BBDd, assuming independent assortment, is 1 BBDD: 1 BbDD: 1 BBDd: 1 BbDd. This is because each parent can produce two types of gametes with respect to the two genes in question, and when these gametes combine, they produce offspring with these four different genotypes.

If the Parent or Offspring Genotypes or Phenotypes Are Known