Dihybrid Punnett Squares

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.

Front

What is a genotype?

Back

The genetic constitution of an individual, specifically the alleles present for a particular gene.

Front

What does a dihybrid cross involve?

Back

A genetic cross that examines the inheritance of two different traits, typically involving two genes.

Front

How many possible genotypes can result from a dihybrid cross?

Back

16 genotypes.

Front

What is the probability of obtaining a homozygous recessive phenotype in a dihybrid cross?

Back

25%.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even if only one copy is present, while recessive alleles require two copies to express their trait.

Front

What is the purpose of a Punnett Square?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.

Front

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

Back

They exhibit the same observable traits but have different genetic makeups.

Front

In a dihybrid cross, what is the expected phenotypic ratio of the offspring?

Back

9:3:3:1.

Front

What is the significance of heterozygous individuals in genetics?

Back

Heterozygous individuals carry two different alleles for a trait, which can lead to variation in offspring.