BIO152H5 Lecture Notes - Lecture 21: Dihybrid Cross, Pea, Housefly
Document Summary
Study for comprehension, know concepts not memorizing examples. Can have a calculator (non-programmable) but it is not needed. Genetic problems will have simple math and be more about understanding the process. A black hamster is crossed with an albino hamster, and a litter of 10 black hamster is born. When an albino hamster is crossed with a 2nd generation black hamster, the offspring are black and albino hamsters. What are the genotypes for the parents and offspring of the. Frist cross: parents=bbxbb, offspring=bb bb b b b b. In tigers, a recessive allele results in lack of pigmentation (white tiger) and a cross-eyed condition. At toronto zoo, two phenotypically normal tigers, that are heterozygous, mated. What fraction of their offspring will be white and cross-eyed? rr=recessive=white&cross-eyed. Rrxrr = 1/4 rr, 1/2 rr, 1/4 rr. Therefore 1/4 of the offspring will be white and cross- eyed.
