40 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 two parents based on their genotypes.

Front

What does genotype mean?

Back

Genotype refers to the genetic constitution of an individual, represented by the alleles they possess.

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present in the genotype.

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present in the genotype.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene.

Front

What is the probability of offspring showing a dominant phenotype if both parents are heterozygous?

Back

75%.

Front

What is the probability of offspring being homozygous recessive if both parents are heterozygous?

Back

25%.

Front

If one parent is homozygous dominant (GG) and the other is homozygous recessive (gg), what is the genotype of the offspring?

Back

All offspring will be heterozygous (Gg).

Front

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

Back

3:1 ratio of dominant to recessive phenotypes.