Punnett Square Credit Genetics and Punnett squares

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 'heterozygous' mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Rr.

Front

What does 'homozygous dominant' mean?

Back

Homozygous dominant means having two identical dominant alleles for a gene, such as RR.

Front

What does 'homozygous recessive' mean?

Back

Homozygous recessive means having two identical recessive alleles for a gene, such as rr.

Front

What is the phenotype?

Back

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

Front

What is the genotype?

Back

The genotype is the genetic constitution of an individual, represented by the alleles it possesses.

Front

What is the probability of offspring being homozygous recessive if both parents are heterozygous?

Back

25%.

Front

If one parent is homozygous dominant (RR) and the other is homozygous recessive (rr), what are the possible genotypes of the offspring?

Back

All offspring will be heterozygous (Rr).

Front

What is the chance of having a recessive phenotype if both parents are heterozygous?

Back

25%.

Front

In a Punnett Square, what do the letters represent?

Back

The letters represent the alleles contributed by each parent.