Genetics Benchmark Review 21-22

If an organism is said to have a genotype of "aa", which of the following then best describes it?

• Homozygous recessive

• Homozygous dominant

• Heterozygous dominant

• Heterozygous recessive

If round seeds (R) are dominant to wrinkled seeds, which best describes a seed that's heterozygous?

• rr

• RR

• Rr

• Wrinkled

Yellow flowers (Y) are dominant to white flowers. Which best describes a genotype of "Yy"?

• yellow

• Homozygous dominant

• Heterozygous recessive

• yy

Based on the Punnett Square shown, what should fill in the missing box?

• GG

• Gg

• gg

• gG

Based on the Punnett Square shown, what should go in the missing boxes?

• BB

• Bb

• bb

• white flower

Based on the Punnett Square shown, what best describes the alleles of missing boxes?

• tt

• Tt

• Homozygous dominant

• Heterozygous

Heterozygous is when...

• the alleles are the same
• the alleles are different
• the alleles are absent
• the alleles are present

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

• recessive
• dominant
• lower case letter
• both 

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

• Tt
• tt
• TT
• t

What you see, or the physical appearance.

• Genotype
• Phenotype
• Homozygous
• Heterozygous