Punnett squares

G = green, g = yellow

The genotype for a yellow plant is...

• GG

• Gg

• gg

• all of the choices result in yellow

Which of the following alleles is purebred recessive?

• Tt

• tt

• TT

Two brown eyed parents (Bb) have a baby. What is the chance their baby is blue eyed?

• 0 %

• 25%

• 50%

• 75%

Each one of the boxes on the Punnett square represents what probability of an offspring's genotype?

• 25%

• 1%

• 10%

• 0%

Aa, DD, Ba, and yy are all examples of ---

• genotypes

• phenotypes

Which of the following genotypes is heterozygous?

• Bb

• BB

• bb

Brown eyes are dominant over blue eyes. What is the probability that the offspring will have brown eyes in this cross?

• 25%

• 50%

• 75%

• 100%

A trait controlled by a recessive allele only appears in the organism's phenotype ---

• if the organism is a hybrid.

• if the organism does not have any dominant alleles.

• if the organism is a purebred.

Which of the following genotypes is heterozygous?

• Bb

• BB

• bb

Which of the following genotypes is homozygous dominant?

• aa

• Aa

• AA