Punnett Squares

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 homozygous dominant mean?

Back

Homozygous dominant refers to having two identical dominant alleles for a trait, represented as 'AA'.

Front

What is the probability of a trait appearing if it is controlled by a recessive allele?

Back

A trait controlled by a recessive allele only appears in the phenotype if the organism does not have any dominant alleles.

Front

What does heterozygous mean?

Back

Heterozygous means having two different alleles for a trait, represented as 'Aa'.

Front

In a Punnett Square, what does 'tt' represent?

Back

'tt' represents a homozygous recessive genotype, which would express the recessive trait.

Front

What is the probability of getting a white flower from a cross of two heterozygous red flowers?

Back

The probability of getting a white flower is 25%.

Front

What is the phenotype of an organism with the genotype 'TT'?

Back

The phenotype of an organism with the genotype 'TT' is tall.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup (alleles) of an organism, while phenotype refers to the observable traits.

Front

If a trait is dominant, what does that mean?

Back

A dominant trait will be expressed in the phenotype even if only one dominant allele is present.

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait if two copies are present (homozygous recessive).