Genetics Review

Front

What is a phenotype?

Back

A phenotype is the physical expression of a trait, such as blue eyes.

Front

What is a homozygous dominant genotype?

Back

A homozygous dominant genotype consists of two identical dominant alleles, such as BB.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype consists of one dominant and one recessive allele, such as Bb.

Front

What are the possible genotypes from crossing a homozygous dominant dog (BB) with a heterozygous dog (Bb)?

Back

50% BB and 50% Bb.

Front

What does genotype refer to?

Back

Genotype refers to the possible combination of alleles in a gene.

Front

What are examples of genotypes?

Back

Aa, DD, Bb, yy are all examples of genotypes.

Front

What is the difference between genotype and phenotype?

Back

Genotype is the genetic makeup (alleles), while phenotype is the observable trait.

Front

What is a recessive trait?

Back

A recessive trait is expressed only when two recessive alleles are present, such as blue eyes (aa).

Front

What is a dominant trait?

Back

A dominant trait is expressed when at least one dominant allele is present, such as brown fur (B).

Front

What is a pedigree chart?

Back

A pedigree chart is a diagram that shows the genetic relationships among a group of individuals.