19.5: ALLELES AND TRAITS REVIEW 15W: 19W2D: BIO

Front

What type of organism has two copies of every gene?

Back

Diploid organisms have two copies of every gene, one inherited from each parent.

Front

In aliens, skin color is a codominant trait. What skin color will the offspring of a pink (A) and blue (B) parent have?

Back

The offspring will have skin color C (pink with blue spots) due to codominance.

Front

TRUE OR FALSE: A Recessive trait is a trait that is not seen when the dominant trait is also present.

Back

TRUE. A recessive trait is masked by the presence of a dominant trait.

Front

What is the locus?

Back

A locus is a specific location on a chromosome where a gene is found.

Front

How many alleles are in a gene?

Back

A gene can have multiple alleles, but typically there are 2 alleles for each gene in diploid organisms.

Front

What is an allele?

Back

An allele is a variant form of a gene that can produce different traits.

Front

Define homozygous.

Back

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

Front

Define heterozygous.

Back

Heterozygous refers to having two different alleles for a particular gene.

Front

What is a dominant trait?

Back

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

Front

What is a recessive trait?

Back

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