Punnett Square Practice

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

How many alleles does an offspring receive from each parent?

Back

One allele from each parent.

Front

What does the term 'dominant trait' mean?

Back

A dominant trait is a genetic trait that is expressed in the phenotype even when only one copy of the allele is present.

Front

What is the probability of an offspring having a dominant trait if both parents are heterozygous?

Back

75%.

Front

What is the probability of producing heterozygous offspring from a cross between two heterozygous parents?

Back

50%.

Front

Define genotype.

Back

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

Front

Define phenotype.

Back

Phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

If B = brown eyes and b = blue eyes, what are the possible genotypes for brown-eyed offspring?

Back

BB or Bb.

Front

What does it mean if two siblings have the same phenotype but different genotypes?

Back

They display the same physical trait but have different genetic combinations (e.g., one is BB and the other is Bb).

Front

What is the expected genotype in box 2 of a Punnett Square if the parents are Bb and Bb?

Back

Bb.