Punnett Squares

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

• 0 %
• 25%
• 50%
• 75%

A person heterozygous for wet earwax (Ww) mates with a person homozygous recessive for dry earwax. What is the chance their baby is heterozygous?

• 0%
• 25%
• 50%
• 100%

Two mice heterozygous for red eyes mate. What is the expected genotypic ratio of their offspring?

• 1 RR: 1 Rr: 1 rr
• 0 RR: 4 Rr: 0 rr
• 1 RR: 2 Rr: 1 rr
• 1 RR: 1 Rr

Which of the following is a phenotype?

• Aa
• red hair
• heterozygous
• DNA

Which of the following is NOT a genotype?

• heterozygous
• a trait
• Bb
• homozygous recessive

Which of the following alleles is homozygous (purebred) recessive?

• Tt
• tt
• TT
• t

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

• 0 %
• 25%
• 50%
• 75%

Aa is

• homozygous (purebred)
• heterozygous (hybrid)

B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.

• they have same phenotype and genotype
• they have different genotypes and phenotypes
• they have same phenotype but different genotypes
• they have same genotype but different phenotypes

A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?

• 25%
• 50%
• 75%
• 100%