Genetics Mini Quiz

Take a out a sheet of paper

Write your name, date and period in top right-hand corner

What is the difference between homozygous and heterozygous

genotypes? Show an example of each.

(Draw, write, or explain)Homozygous = TT or tt, 2 alleles that have the same

dominant/recessive genotype.Heterozygous = Tt, 2 alleles that have 1 recessive & 1 dominant

genotype, hybrid.

What is the difference between phenotype and genotype? Explain

and give example(Draw, write, or explain)

Phenotype = visible characteristics of an organism, (fur, eye color, features, etc)

Genotype = Non-visible, genetic code, TT, Tt, tt, tells what phenotypes will be expressed

Punnett Square

1. In seals, the gene for long whiskers is dominant (W). a) What percent of the offspring will have short whiskers if a homozygous long-whiskered seal is crossed with a heterozygous long-whiskered seal?

0% of the offspring will have short whiskers

WW WW

Ww Ww