Genotypes, Phenotypes, and Punnett Squares

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

What are alleles?

Back

Alleles are different forms of the same gene that can exist at a specific locus on a chromosome.

Front

In a heterozygous genotype, which allele is expressed in the phenotype?

Back

The dominant allele is expressed in the phenotype.

Front

How are dominant alleles represented?

Back

Dominant alleles are represented using CAPITAL letters.

Front

What genotype does a hairless guinea pig have if hair is dominant to no hair?

Back

The genotype of a hairless guinea pig is hh.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, specifically the alleles present at a given locus.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., AA or aa).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Aa).

Front

What is the purpose of a Punnett square?

Back

A Punnett square is a diagram used to predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What is the law of segregation?

Back

The law of segregation states that during the formation of gametes, the two alleles for a gene separate from each other.