Punnett Square Practice

Front

What does heterozygous mean?

Back

Heterozygous means that the alleles are different.

Front

What is the genotype of a mother with two recessive alleles?

Back

The mother's genotype is dd.

Front

What is the probability of producing heterozygous offspring from a cross?

Back

The probability of heterozygous offspring is 50%.

Front

What does homozygous mean?

Back

Homozygous means that the alleles are the same.

Front

What is the chance of offspring showing a recessive trait if both parents are heterozygous?

Back

The chance is 25%.

Front

What is a Punnett Square used for?

Back

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

Front

Define allele.

Back

An allele is a variant form of a gene.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even if only one copy is present, while recessive alleles require two copies to express their trait.

Front

If one parent is homozygous dominant (DD) and the other is homozygous recessive (dd), what are the possible genotypes of the offspring?

Back

All offspring will be heterozygous (Dd).

Front

What does it mean if an organism is homozygous recessive?

Back

It means that the organism has two recessive alleles (e.g., dd).