Genetics 101

Which is an example of an allele?

• AA

• Aa

• A

• aa

Green peas are dominant (G) to yellow peas (g). What is the genotype for a hetereozygous offspring?

• Gg

• gg

• GG

• Green coloration

Which of the following is a heterozygous genotype?

• GG

• gg

• GGG

• Gg

Dominant alleles are usually represented by a(n)

• phenotype

• lower case letter

• upper case letter

• punnett square

True or False:

A heterozygous genotype can be written as BB.

• True

• False

D = dimples d = no dimples

What is the genotype for a homozygous recessive individual?

• DD

• Dd

• dd

Round (R) seeds are dominant to wrinkled (r) seeds.
What is the genotype for a homozygous dominant offspring?

• RR
• Rr
• rr

What do you call the physical expression of a gene?

• genotype
• dominant
• phenotype
• allele

Short hair (S) is dominant to long hair (s).
What is the genotype for an offspring with long hair?

• SS
• Ss
• ss

The allele combinations are called...

• genetics

• mitosis

• the genotype

• the phenotype