Mendelian Genetics Concepts

This video explores Mendelian genetics using pea plants, focusing on two traits: color and shape. It explains the process of crossing homozygous dominant and recessive parents to produce an F1 generation, which is heterozygous for both traits. The video then demonstrates a dihybrid cross using a Punnett square to predict the F2 generation's genotype and phenotype ratios, highlighting Mendel's laws of segregation and independent assortment.

What are the two traits being studied in the pea plants in this video?

• Pea color and shape

• Pea color and height

• Pea shape and size

• Pea size and height

What is the phenotype of a pea plant that is homozygous dominant for both color and shape?

• Green and round

• Yellow and round

• Yellow and wrinkled

• Green and wrinkled

What is the genotype of the F1 generation when a homozygous dominant parent is crossed with a homozygous recessive parent?

• Heterozygous for both traits

• Homozygous dominant

• Homozygous recessive

• Heterozygous for one trait

What is a dihybrid cross?

• A cross involving three genes

• A cross involving two genes

• A cross involving one gene

• A cross involving four genes

According to Mendel's law of independent assortment, how do alleles of different genes segregate?

• Sequentially

• Randomly

• Independently

• Dependently

What is the expected phenotypic ratio in the F2 generation from a dihybrid cross?

• 9:3:3:1

• 3:1

• 1:1

• 2:1

How many phenotypes are expected in the F2 generation of a dihybrid cross?

• Five

• Two

• Three

• Four

Which phenotype is most common in the F2 generation of a dihybrid cross?

• Yellow and round

• Green and round

• Yellow and wrinkled

• Green and wrinkled

What is the probability of getting a green and wrinkled phenotype in the F2 generation?

• 3/16

• 9/16

• 12/16

• 1/16

Why might the observed phenotypic ratios in an experiment differ from the expected 9:3:3:1 ratio?

• Because of genetic mutations

• Due to experimental error

• Because of environmental factors

• Because of probabilistic variation