Punnett Squares

Why do scientist use Punnett Squares?

• A tool scientist use to to see alleles

• A tool scientist use to see which alleles are dominant

• A tool scientist use to determine possible genotypes for offspring

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

• 25%

• 1%

• 10%

• 0%

In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?

• Tall = T
  Short = S
• Tall = T
  Short = t
• Tall = t
  Short = T
• Tall = TT
  Short = tt

What you see, or the physical appearance.

• Genotype
• Phenotype
• Homozygous
• Heterozygous

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

• recessive

• dominant

• both

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

• genotypes

• phenotypes

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

AA and Aa always show up as ---

• dominant.

• recessive.

Which of the following genotypes is homozygous dominant?

• aa

• Aa

• AA