Answer to Question #149230 in Genetics for Kate

Question

Probability rules can be used to solve genetics problems. An organism that has the genotype AaBbCC is crossed with an organism that has the genotype AaBbCc. Assume all genes are on separate sets of chromosomes (that is, they are not linked).
a) What is the probability that any of the offspring will have the genotype AABBCC?
Hint: To get the answer, first determine the probability of each allele in the gametes (i.e. egg and sperm). Next, determine the individual probabilities of getting AA offspring from the monohybrid cross. Then do the same to determine the probabilities of getting BB offspring and CC offspring. Finally, multiply these probabilities together.
b) What is the probability that any of the offspring will have the genotype AabbCc?

Answer 1

The probability off finding an offspring having the genotype AABBCC, will be 1/64 or 0.0156, since the probability of finding AA,BB,CC from an individual monohybrid cross would all be 1/4.

The probability of finding an offspring having the genotype AabbCc will be 1/16 or 0.0625, since the probability of Aa will be 1/2 and that of bb 1/4 and finally Cc, 1/2.