Punnett Squares and Genotypes

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, specifically the alleles inherited from the parents.

Front

What is the difference between dominant and recessive traits?

Back

Dominant traits are expressed in the phenotype even if only one allele is present, while recessive traits are expressed only when two recessive alleles are present.

Front

What is a homozygous genotype?

Back

A homozygous genotype has two identical alleles for a trait, such as AA or aa.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype has two different alleles for a trait, such as Aa.

Front

In a Punnett Square, what does each box represent?

Back

Each box represents a possible genotype of the offspring and the probability of that genotype occurring.

Front

If a plant has the genotype 'Gg', what color will it be?

Back

It will be green, as 'G' (green) is dominant over 'g' (yellow).

Front

What is the probability of getting a homozygous recessive offspring from a cross of two heterozygous parents (Aa x Aa)?

Back

The probability is 25%.

Front

What does the term 'phenotype' refer to?

Back

Phenotype refers to the observable characteristics or traits of an organism, determined by its genotype.

Front

If a genotype is 'BB', what is the phenotype?

Back

The phenotype will be dominant, such as brown fur in the case of fur color.