Genetics of Pea Plants

The video tutorial explains the genetic principles of dominant and recessive traits in pea plants, focusing on pea shape and flower color. It describes a genetic cross between two plants with different genotypes and uses Punnett squares to predict the traits of the offspring. The analysis reveals that while pea shape varies, all offspring will have purple flowers due to the presence of a dominant allele. The tutorial concludes by emphasizing the impact of homozygous dominant traits on offspring characteristics.

What is the dominant trait for pea shape in pea plants?

• Wrinkled peas

• Smooth peas

• Purple flowers

• White flowers

Which flower color is dominant in pea plants?

• Yellow

• Purple

• White

• Red

What is the genotype of the first plant in the cross?

• Homozygous dominant for both traits

• Heterozygous for pea shape, homozygous dominant for flower color

• Homozygous recessive for both traits

• Heterozygous for both traits

What is the genotype of the second plant in the cross?

• Homozygous recessive for pea shape, heterozygous for flower color

• Heterozygous for pea shape, homozygous recessive for flower color

• Heterozygous for both traits

• Homozygous dominant for both traits

How many Punnett squares are needed for this genetic cross?

• One

• Two

• Three

• Four

What is the expected distribution of pea shapes in the offspring?

• 50% smooth, 50% wrinkled

• 75% smooth, 25% wrinkled

• 100% wrinkled

• 100% smooth

What is the expected distribution of flower colors in the offspring?

• 100% white

• 75% purple, 25% white

• 50% purple, 50% white

• 100% purple

Which trait will appear in all offspring?

• Smooth peas

• Wrinkled peas

• Purple flowers

• White flowers

Why do all offspring have purple flowers?

• Both parents are homozygous recessive for flower color

• One parent is homozygous dominant for flower color

• Both parents are heterozygous for flower color

• One parent is homozygous recessive for flower color

What does it mean if a parent is homozygous dominant for a trait?

• None of the offspring will have the dominant trait

• Half of the offspring will have the dominant trait

• All offspring will have the dominant trait

• All offspring will have the recessive trait