Monohybrid Crosses and Pea Plant Genetics Explained

This video tutorial explains the concept of a monohybrid cross, a genetic mating event between two heterozygous parents for a single gene. Using pea plants as an example, it illustrates how dominant and recessive alleles determine pea color. The video demonstrates how to use a Punnett square to predict offspring genotypes and phenotypes, showing a typical 1:2:1 genotype ratio and a 3:1 phenotype ratio. It concludes by highlighting that observing a 3:1 phenotype ratio suggests both parents are heterozygotes and encourages further exploration of related genetic crosses.

What does the term 'monohybrid' refer to in a monohybrid cross?

• A cross involving identical alleles

• A cross involving two genes

• A cross involving multiple alleles

• A cross involving a single gene

In the pea plant example, what color are the peas if the plant is homozygous recessive?

• Blue

• Red

• Green

• Yellow

What is the significance of the dominant allele in pea plants?

• It results in blue peas

• It results in red peas

• It results in yellow peas

• It results in green peas

What is the expected genotype ratio in a typical monohybrid cross?

• 2:1

• 1:2:1

• 1:1

• 3:1

How many quarters of the offspring will have yellow peas in a monohybrid cross?

• Three quarters

• Two quarters

• All offspring

• One quarter

If two heterozygous parents produce 100 offspring, how many are expected to have green peas?

• 25

• 75

• 50

• 100

What phenotype ratio is typically observed in a monohybrid cross?

• 2:1

• 3:1

• 1:2:1

• 1:1

What can you infer if two organisms produce offspring with a 3:1 phenotype ratio?

• Both parents are homozygous

• Both parents are recessive

• Both parents are heterozygous

• One parent is homozygous, the other is heterozygous

What should you expect if you observe a 3:1 phenotype ratio in offspring?

• One parent is homozygous, the other is heterozygous

• Both parents are heterozygous

• Both parents are recessive

• Both parents are homozygous