Punnett Squares - Complete Dominance

Front

What is a Punnett Square?

Back

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

Front

What does 'complete dominance' mean in genetics?

Back

Complete dominance occurs when the phenotype of the dominant allele completely masks the phenotype of the recessive allele in a heterozygote.

Front

What is a homozygous dominant genotype?

Back

A homozygous dominant genotype consists of two identical dominant alleles, represented as 'AA'.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype consists of one dominant and one recessive allele, represented as 'Aa'.

Front

What is a homozygous recessive genotype?

Back

A homozygous recessive genotype consists of two identical recessive alleles, represented as 'aa'.

Front

In a genetic cross, what does the letter 'R' typically represent?

Back

The letter 'R' typically represents a dominant allele in a genetic cross.

Front

In a genetic cross, what does the letter 'r' typically represent?

Back

The letter 'r' typically represents a recessive allele in a genetic cross.

Front

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

Back

The phenotype of a plant with the genotype 'RR' is dominant, which in this case is smooth peas.

Front

What is the probability of obtaining a homozygous recessive offspring from a cross between 'Rr' and 'Rr'?

Back

The probability is 25%.

Front

What is the phenotype of offspring from a cross between 'RR' and 'rr'?

Back

All offspring will have the dominant phenotype.