Mendel and Punnett Squares

Front

What is an allele?

Back

An allele is a variation of a certain gene, such as different eye colors.

Front

True or False: Punnett Squares are used to find out the probability of a gene being observed in offspring.

Back

True

Front

What is a phenotype? Give an example.

Back

A phenotype is the observable physical characteristics of an organism. Example: blue eyes.

Front

What is the dominant trait in pea shape if R = round and r = wrinkled?

Back

The dominant trait is round pea shape (R).

Front

What is the recessive trait in pea shape if R = round and r = wrinkled?

Back

The recessive trait is wrinkled pea shape (r).

Front

What are the possible phenotypes from a cross Rr x Rr?

Back

Round: 75%, Wrinkled: 25%.

Front

What are the possible phenotypes from a cross rr x Rr?

Back

Round: 50%, Wrinkled: 50%.

Front

What does a Punnett Square show?

Back

A Punnett Square shows the possible genetic combinations from a cross between two organisms.

Front

What is the purpose of using a Punnett Square in genetics?

Back

To predict the probability of offspring inheriting particular traits.

Front

If a plant has the genotype Rr, what is its phenotype?

Back

The phenotype is round peas.