Genetics and Punnett Squares Review

In alleles, capital letters show:

• Recessive traits.

• Dominant traits.

Homozygous means:

• Different alleles. Ex: Tt

• Same alleles. Ex: tt

Heterozygous means:

• Same alleles. Ex: TT

• Different alleles. Ex: Tt

What is true about genotypes?

• Genotypes are the traits that show up/

• Genotypes are the gene combinations.

Phenotypes refer to:

• Gene combinations.

• Traits that show up.

Why do we use Punnett Squares?

• To learn times tables.

• To learn chemistry equations.

• To study probability of genes.

• To understand physics.

Study the Punnett Square. What is the probability of a dominant trait showing up?

• 0%

• 25%

• 50%

• 100%

Study the Punnett Square. What is the probability of having heterozygous dominant traits?

• 0%

• 25%

• 50%

• 75%

Study the Punnett Square. What is the probability of having a recessive trait?

• 100%

• 50%

• 25%

• 0%

Who was Gregor Mendel?

• A famous physicist?

• The astronomer who discovered Pluto.

• A priest considered the Father of Genetics.

• A biologist who discovered viruses.