Genetics

Front

What is a recessive allele?

Back

An allele whose trait only shows up when no dominant allele is present.

Front

How many different phenotypes are possible when a heterozygous tall corn plant mates with a short corn plant?

Back

2

Front

What are the possible genotypes of offspring when a heterozygous tall pea plant is crossed with a short pea plant?

Back

50% Tt, 50% tt

Front

What does incomplete dominance mean in genetics?

Back

It means that the traits are blended.

Front

What is the genotypic ratio when T=Tall and t=short?

Back

1TT:2Tt:1tt

Front

Define dominant allele.

Back

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

Front

What is a phenotype?

Back

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

Front

What is a genotype?

Back

The genetic constitution of an individual, represented by the alleles inherited from the parents.

Front

Explain the concept of homozygous alleles.

Back

Homozygous alleles are two identical alleles for a particular gene, either dominant (TT) or recessive (tt).

Front

Explain the concept of heterozygous alleles.

Back

Heterozygous alleles are two different alleles for a particular gene (Tt).