10.2 Genetics & Punnett Squares

Front

What is a homozygous recessive genotype?

Back

A genotype consisting of two identical recessive alleles, such as 'rr'.

Front

What is the genotype of a green pea plant that is heterozygous?

Back

Gg, where 'G' is the dominant allele for green and 'g' is the recessive allele for yellow.

Front

What is the result of crossing a heterozygous green pea plant (Gg) with a homozygous recessive yellow pea plant (gg)?

Back

50% heterozygous (Gg) and 50% homozygous recessive (gg) offspring.

Front

What does it mean if an organism is heterozygous?

Back

It has two different alleles for a trait, making it a hybrid.

Front

What are alleles?

Back

Different versions of a gene that determine specific traits, such as tall or short.

Front

What is a Punnett Square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

What is the phenotype of an organism?

Back

The observable physical characteristics or traits of an organism.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup (alleles), while phenotype refers to the physical expression of those genes.

Front

What does it mean for a trait to be dominant?

Back

A dominant trait is expressed in the phenotype even if only one dominant allele is present.

Front

What does it mean for a trait to be recessive?

Back

A recessive trait is expressed in the phenotype only when two recessive alleles are present.