Genetics

Front

What is a homozygous recessive genotype?

Back

A genotype consisting of two identical recessive alleles, represented as 'bb'.

Front

What is a phenotype?

Back

The physical expression or characteristics of an organism, such as 'blue eyes'.

Front

What is a Punnett Square used for?

Back

A tool used to predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What is the genotypic ratio when crossing two heterozygous plants (Tt x Tt)?

Back

1:2:1, representing the possible genotypes: TT, Tt, and tt.

Front

What is the phenotypic ratio when crossing two heterozygous plants (Tt x Tt)?

Back

3:1, representing the ratio of tall to short plants.

Front

Define genotype.

Back

The genetic makeup of an organism, represented by the combination of alleles (e.g., BB, Bb, bb).

Front

What does it mean if an allele is dominant?

Back

It means that the allele will express its trait even if only one copy is present (e.g., T in Tt).

Front

What does it mean if an allele is recessive?

Back

It means that the allele will only express its trait if two copies are present (e.g., bb).

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous has two identical alleles (e.g., BB or bb), while heterozygous has two different alleles (e.g., Bb).

Front

What is the purpose of a test cross?

Back

To determine the genotype of an organism with a dominant phenotype by crossing it with a homozygous recessive organism.