Genotype, Phenotype, & Punnett Squares

Front

What is a genotype?

Back

The genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., GG, Gg, gg).

Front

What is a phenotype?

Back

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

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., GG or gg).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Gg).

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

If G = green and g = yellow, what is the phenotype of a plant with genotype gg?

Back

The phenotype of a plant with genotype gg is yellow.

Front

What is the genotype of a homozygous dominant flower with red petals?

Back

The genotype of a homozygous dominant flower with red petals is RR.

Front

What is the genotype of a homozygous recessive plant?

Back

The genotype of a homozygous recessive plant is represented as 'tt'.

Front

In a Punnett square, what does each box represent?

Back

Each box in a Punnett square represents a possible genotype of the offspring resulting from the combination of alleles from the parents.

Front

What is the expected genotype ratio from a monohybrid cross between two heterozygous parents (Gg x Gg)?

Back

The expected genotype ratio is 1 GG : 2 Gg : 1 gg.