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