Monohybrid crosses

Front

Which of the following alleles is homozygous recessive? Options: Tt, tt, TT, T

Back

tt

Front

The physical expression of a genetic trait is called a

Back

phenotype

Front

What is an allele?

Back

alternate forms of a gene

Front

Having two of the same genes for the trait (sometimes called purebred) is called

Back

homozygous

Front

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

Back

recessive allele

Front

What is a dominant allele?

Back

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

Front

Define genotype.

Back

The genetic makeup of an organism, represented by the alleles it possesses.

Front

What is the purpose of a Punnett square?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What does it mean if an organism is heterozygous?

Back

It has two different alleles for a particular gene.

Front

What is the difference between phenotype and genotype?

Back

Phenotype is the physical expression of traits, while genotype is the genetic makeup.