Punnett Square Practice

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What does it mean if an allele is dominant?

Back

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

Front

What does it mean if an allele is recessive?

Back

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

Front

What is the genotype of a homozygous dominant organism?

Back

The genotype of a homozygous dominant organism consists of two identical dominant alleles, such as 'PP'.

Front

What is the genotype of a homozygous recessive organism?

Back

The genotype of a homozygous recessive organism consists of two identical recessive alleles, such as 'pp'.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype consists of one dominant allele and one recessive allele, such as 'Pp'.

Front

In a Punnett Square, where are the parent alleles written?

Back

The parent alleles are written outside of the boxes, typically on the top and left side.

Front

What is the probability of an offspring being purple if both parents are homozygous dominant (PP)?

Back

100% probability of being purple.

Front

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

Back

All offspring will be heterozygous (Pp).

Front

What is the phenotypic ratio of a monohybrid cross between two heterozygous parents (Pp x Pp)?

Back

The phenotypic ratio is 3:1 (3 purple: 1 white).