Unit 4 - Genetics Test Corrections

Front

What is an allele?

Back

An allele is one form of a gene that can exist at a specific locus on a chromosome.

Front

What is the phenotype of an organism?

Back

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

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous genotypes have two identical alleles for a trait, while heterozygous genotypes have two different alleles for a trait.

Front

What is incomplete dominance?

Back

Incomplete dominance is a type of inheritance where the traits of two alleles blend together in the phenotype of the offspring.

Front

What is co-dominance?

Back

Co-dominance is a type of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits.

Front

What is a Punnett square?

Back

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

Front

What does it mean for a trait to be dominant?

Back

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

Front

What does it mean for a trait to be recessive?

Back

A recessive trait is one that is only expressed in the phenotype when two copies of the allele are present.

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 is a test cross?

Back

A test cross is a breeding experiment used to determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual.