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 'AA' represent in genetics?

Back

'AA' represents a homozygous dominant genotype, meaning both alleles are the same and dominant.

Front

What does 'aa' represent in genetics?

Back

'aa' represents a homozygous recessive genotype, meaning both alleles are the same and recessive.

Front

What does 'Aa' represent in genetics?

Back

'Aa' represents a heterozygous genotype, meaning one allele is dominant and the other is recessive.

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

A phenotype is the physical appearance or observable traits of an organism, resulting from its genotype.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait, while heterozygous means having two different alleles for a trait.

Front

If T = tall and t = short, what is the phenotype of a plant with genotype Tt?

Back

The phenotype of a plant with genotype Tt is tall, because the dominant allele T is expressed.

Front

In a Punnett Square, what do the letters on the top and side represent?

Back

The letters on the top and side represent the alleles contributed by each parent in a genetic cross.

Front

What is the expected phenotype ratio of offspring from a cross between two heterozygous parents (Tt x Tt)?

Back

The expected phenotype ratio is 3 tall (T) to 1 short (t).