Genetics

Front

What does genotype refer to?

Back

The possible combination of alleles in a gene.

Front

Which of the following is heterozygous?

Back

Bb

Front

In a Punnett Square, if tall is dominant to short, what is the genotypic ratio when crossing two heterozygous plants?

Back

1:2:1

Front

What is a phenotype?

Back

The physical expression of a trait, such as blue eyes.

Front

When two heterozygous tall pea plants (Tt) are crossed, what describes their offspring?

Back

75% tall and 25% short.

Front

What is the definition of an allele?

Back

An allele is a variant form of a gene.

Front

What is the difference between dominant and recessive alleles?

Back

A dominant allele masks the effect of a recessive allele in a heterozygous genotype.

Front

What is a homozygous genotype?

Back

A genotype consisting of two identical alleles for a trait, such as TT or tt.

Front

What is a Punnett Square used for?

Back

A Punnett Square is used to predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What does it mean if an organism is homozygous recessive?

Back

It has two recessive alleles for a trait, such as 'bb' for short plants.