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 the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Front

What does the term 'phenotype' refer to?

Back

Phenotype refers to the observable characteristics or traits of an organism, which result from the interaction of its genotype with the environment.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait (e.g., BB or bb), while heterozygous means having one dominant and one recessive allele (e.g., Bb).

Front

If B = brown fur and b = white fur, what is the probability of getting brown fur from a Bb x Bb cross?

Back

75% probability of brown fur.

Front

What is the genotype for an organism with white fur if B = brown fur and b = white fur?

Back

The genotype must be bb.

Front

What does it mean if an organism is 'homozygous recessive'?

Back

It means the organism has two recessive alleles for a trait (e.g., bb).

Front

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

Back

The letters represent the alleles contributed by each parent in a genetic cross.

Front

What is the expected phenotype ratio from a monohybrid cross of two heterozygous parents (Bb x Bb)?

Back

The expected phenotype ratio is 3:1 (3 brown fur : 1 white fur).

Front

What is the significance of dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in determining the phenotype.