genetics, punnett squares, heredity

Front

What is a recessive allele?

Back

A recessive allele is represented by a lowercase letter and is only expressed when two copies are present.

Front

What does genotype refer to?

Back

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

Front

What is the probability of producing a short plant from a Tt x Tt cross?

Back

25%.

Front

What does homozygous mean?

Back

Homozygous means the alleles are the same.

Front

What is a dominant allele?

Back

A dominant allele is represented by a capital letter and is expressed even if only one copy is present.

Front

What is a phenotype?

Back

Phenotype refers to the physical expression of the genes.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles, while heterozygous means having two different alleles.

Front

What is a Punnett square used for?

Back

A Punnett square is used to predict the genetic outcomes of a cross between two organisms.

Front

If a plant has the genotype Tt, what is its phenotype?

Back

The phenotype is tall, since T (tall) is dominant over t (short).

Front

What is the expected genotypic ratio from a Tt x Tt cross?

Back

1 TT : 2 Tt : 1 tt.