Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genotype and phenotype combinations of a genetic cross.

Front

What does the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses.

Front

What does the term 'phenotype' refer to?

Back

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

Front

In a genetic cross, what does a dominant allele do?

Back

A dominant allele masks the effect of a recessive allele in a heterozygous genotype.

Front

How are dominant alleles represented in genetic notation?

Back

Dominant alleles are represented by capital letters.

Front

How are recessive alleles represented in genetic notation?

Back

Recessive alleles are represented by lowercase letters.

Front

What is the genotype of a plant with red flowers (R) that is homozygous?

Back

The genotype is RR.

Front

What is the genotype of a white-flowering plant in a species where red (R) is dominant?

Back

The genotype is rr.

Front

If a heterozygous plant (Rr) is crossed with a homozygous recessive plant (rr), what are the possible genotypes of the offspring?

Back

The possible genotypes are Rr and rr.

Front

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

Back

The expected phenotype ratio is 3:1 (3 red flowers to 1 white flower).