Pea Pod Genetics and Alleles

The video tutorial explains the concept of monohybrid crosses using pea pods, focusing on dominant and recessive alleles. It covers pure breeding, the creation of F1 and F2 generations, and the use of Punnett squares to predict offspring genotypes and phenotypes. The tutorial also introduces the test cross method to determine unknown genotypes. The video concludes with a brief mention of additional resources for A-level biology students.

What is the dominant allele for color in pea pods?

• Blue allele, large B

• Red allele, large R

• Green allele, large G

• Yellow allele, little g

In a pure breeding green pea pod, what is the genotype?

• gg

• gG

• GG

• Gg

What is the phenotype of the F1 generation when a pure green pea pod is crossed with a pure yellow pea pod?

• All yellow

• All green

• Half green, half yellow

• Three green, one yellow

What is the genotype of the F1 generation when a pure green pea pod is crossed with a pure yellow pea pod?

• gG

• gg

• Gg

• GG

In the F2 generation, what is the expected ratio of green to yellow pea pods?

• 4:0

• 2:2

• 3:1

• 1:1

What does a heterozygous genotype mean?

• Three alleles

• No alleles

• Two different alleles

• Two identical alleles

What is the purpose of a test cross?

• To determine the phenotype

• To determine the genotype

• To determine the color

• To determine the size

If a test cross results in all green offspring, what is the genotype of the unknown parent?

• Gg

• GG

• gG

• gg

What is the genotype of a homozygous recessive pea pod?

• GG

• Gg

• gG

• gg

If half of the offspring from a test cross are yellow, what is the genotype of the unknown parent?

• Gg

• gg

• gG

• GG