Punnett Square Practice

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from a cross between two parents.

Front

What does HETEROZYGOUS mean?

Back

HETEROZYGOUS refers to having two different alleles for a specific gene, one inherited from each parent.

Front

What is the percent chance of offspring being HETEROZYGOUS if both parents are HETEROZYGOUS?

Back

50%.

Front

What does HOMOZYGOUS mean?

Back

HOMOZYGOUS refers to having two identical alleles for a specific gene.

Front

What is the percent chance of offspring having NO belly fur if one parent is homozygous dominant and the other is heterozygous?

Back

25%.

Front

What is the percent chance of offspring HAVING belly fur if both parents are heterozygous?

Back

75%.

Front

How do you calculate the probability of a trait using a Punnett Square?

Back

By filling in the square with the possible allele combinations from each parent and counting the outcomes.

Front

What is the significance of dominant and recessive alleles in genetics?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous individuals.

Front

If a trait is recessive, what is the minimum genotype required for it to be expressed?

Back

The individual must be homozygous recessive.

Front

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous parents?

Back

3:1 ratio of dominant to recessive phenotypes.