6 - Genetics & Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What does it mean for an allele to be dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does it mean for an allele to be recessive?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype.

Front

What is the genotype of a heterozygous organism?

Back

The genotype of a heterozygous organism consists of two different alleles, such as Rr.

Front

What is the phenotype of an organism?

Back

The phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

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

Back

25%.

Front

What is homozygous?

Back

An organism is homozygous when it has two identical alleles for a particular trait, such as RR or rr.

Front

What is heterozygous?

Back

An organism is heterozygous when it has two different alleles for a particular trait, such as Rr.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism, while phenotype refers to the physical expression of that genetic makeup.

Front

What does it mean if an organism is homozygous recessive?

Back

An organism is homozygous recessive if it has two recessive alleles for a trait, such as rr.