TEST_8th-Ch 2:2 -Understanding Inheritance

Front

What is a gene?

Back

A piece of a chromosome with code for one trait.

Front

What is the genotype for a homozygous dominant trait?

Back

RR

Front

What is the genotype for a heterozygous trait?

Back

Rr

Front

What is the genotype for a homozygous recessive trait?

Back

rr

Front

What percentage of offspring would be homozygous recessive if a homozygous dominant organism mates with a heterozygous organism?

Back

0 percent.

Front

When both alleles of a trait are expressed in the phenotype, this is known as _____________.

Back

codominance.

Front

The alleles that control how a trait is expressed are its __________.

Back

genotype.

Front

What is incomplete dominance?

Back

A situation in which one allele does not completely dominate another, resulting in a new phenotype.

Front

What is phenotype?

Back

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

Front

What is a dominant allele?

Back

An allele that expresses its phenotype even in the presence of a recessive allele.