Exploring Punnett Squares with Gregor Mendel

The video tutorial explains how traits are inherited from parents, using Gregor Mendel's pioneering work on heredity. It introduces the concept of dominant and recessive genes and demonstrates how to predict offspring traits using a Punnett Square. The tutorial uses rabbits and corn as examples to illustrate these genetic principles, emphasizing that dominant traits overshadow recessive ones. The video concludes by applying these rules to predict the color distribution in hybrid corn.

Who was the Austrian monk that studied heredity using pea plants?

• Charles Darwin

• Gregor Mendel

• Louis Pasteur

• Isaac Newton

What does it mean if a gene is dominant?

• It has more influence or power over another gene

• It is always passed down to offspring

• It has less influence over a trait

• It is hidden and not expressed

Which of the following is an example of a dominant trait?

• A white rabbit's fur color

• A black rabbit's fur color

• A hybrid rabbit's recessive gene

• A hybrid rabbit's white gene

In the example with the black and white rabbits, what does 'purebred' mean?

• The rabbit has mixed genes for a trait

• The rabbit has two identical genes for a trait

• The rabbit has one black and one white gene

• The rabbit's genes are unknown

What is a hybrid in genetic terms?

• An organism with only dominant genes

• An organism with mixed genes for a trait

• An organism with two identical genes for a trait

• An organism with only recessive genes

Tags

NGSS.MS-LS3-2

What does it mean if a trait is recessive?

• It is passed down to all offspring

• It has more influence over a trait

• It is hidden and not expressed when a dominant gene is present

• It is always expressed

What is the purpose of a Punnett square?

• To blend traits of two organisms

• To identify dominant genes only

• To predict the possible gene combinations of offspring

• To determine the exact genes of an organism

If two hybrid rabbits mate, what is the probability of getting a white offspring?

• 1 in 4

• 1 in 5

• 1 in 3

• 1 in 2

Tags

NGSS.MS-LS3-2

Why won't any of the offspring be gray in the rabbit example?

• Because gray is not a possible gene combination

• Because gray is a recessive trait

• Because the traits are not blended

• Because gray is a dominant trait

What happens when you cross hybrid purple corn with hybrid yellow corn?

• All kernels will be purple

• Kernels will be 50% purple and 50% yellow

• Kernels will be 75% purple and 25% yellow

• All kernels will be yellow

Tags

NGSS.MS-LS3-2