Genetics Review

2/18 Warm-upSet up Dihybrid Cross with these parents:

-BbTt X BbTT

The physical appearance of an organism, is the organism’s………

Phenotype

In Guinea pigs rough hair (R) is dominant of smooth (r). Cross a hybrid for rough hair and a purebred with smooth. What would the cross look like?

Rr X rr

Gregor Mendel• Father of genetics• Studied

inheritance in PEA PLANTS

P=Purplep=White

PpWhat is the Phenotype?

Purple

White

What is the Genotype?

pp

Phenotypic Ratio?

2:2Yellow:Green

TD, tD

A woman who is heterozygous Tongue Roller (Tt) and Homozygous for Dimples (DD).

What are the possible gametes?

RRyy

9:3:3:1Phenotypic Ratio?

PPP