Final Review Genetics

Front

What is the result of crossing a homozygous dominant dog (BB) with a heterozygous dog (Bb)?

Back

50% BB and 50% Bb.

Front

What does homozygous mean in genetics?

Back

Homozygous refers to having two identical alleles for a particular gene.

Front

What are the genotypes of parents in a pedigree where blue eyes (recessive trait) are observed?

Back

aa, aa.

Front

What does genotype refer to?

Back

The possible combination of alleles in a gene.

Front

Which of the following is homozygous dominant?

Back

BB.

Front

What is the definition of a heterozygous genotype?

Back

A genotype consisting of two different alleles for a gene (e.g., Bb).

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous conditions.

Front

What is a phenotype?

Back

The physical expression or characteristics of a genotype.

Front

What does it mean if an organism is homozygous recessive?

Back

It has two identical recessive alleles for a trait (e.g., bb).

Front

How can you determine the genotype of an organism with a dominant phenotype?

Back

By performing a test cross with a homozygous recessive organism.