Punnett Squares

The video tutorial explains Mendel's theory of genetic inheritance, focusing on monohybrid crosses and the use of Punnett squares to predict offspring genotypes. It provides examples using pea pod colors and cystic fibrosis to illustrate how dominant and recessive genes affect inheritance. The tutorial also covers the process of meiosis and how it leads to the separation of chromosomes, allowing for the prediction of genetic outcomes using Punnett squares.

What does a capital letter represent in a Punnett square?

• A recessive allele

• A dominant allele

• A mixture of alleles

• An unknown allele

In a Punnett square, what is the expected phenotypic ratio when crossing a heterozygous yellow pea pod with a recessive green pea pod?

• 4:0 yellow to green

• 3:1 yellow to green

• 1:1 yellow to green

• 2:1 yellow to green

What is the probability of offspring being cystic fibrosis sufferers when two carrier parents mate?

• 50%

• 25%

• 75%

• 0%

How are alleles separated during meiosis?

• They are mixed together

• They remain unchanged

• They are duplicated

• They are separated into halves

What is the significance of using Punnett squares in genetics?

• To determine the exact number of offspring

• To eliminate recessive traits

• To predict the probability of genotypes

• To create new genetic combinations