Genetics- Dihybrid Punnett Squares

Front

What does it mean for an organism to be heterozygous?

Back

An organism is heterozygous (or hybrid) when it has two different alleles for a particular gene, such as Aa.

Front

What is the genotype of a white mouse with red eyes if it is recessive for both traits?

Back

The genotype of the white mouse with red eyes is bbee.

Front

What is the genotype of a black mouse with brown eyes if it is dominant for both traits?

Back

The genotype of the black mouse with brown eyes is BBEE.

Front

In a dihybrid cross, what does the notation BBEE x bbee represent?

Back

It represents a cross between a homozygous dominant organism for both traits (BBEE) and a homozygous recessive organism for both traits (bbee).

Front

What is the expected genotypic ratio from a dihybrid cross of BBEE x bbee?

Back

The expected genotypic ratio is BB = 25%, Bb = 50%, bb = 25%.

Front

What is the definition of phenotype?

Back

Phenotype refers to the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

What is the genotype of a heterozygous green watermelon where green rinds (G) are dominant to striped rinds (g)?

Back

The genotype of a heterozygous green watermelon is Gg.

Front

What is a Punnett square used for in genetics?

Back

A Punnett square is a diagram used to predict the genotypes of a particular cross or breeding experiment.

Front

What is the phenotypic ratio expected from a dihybrid cross?

Back

The expected phenotypic ratio from a dihybrid cross is typically 9:3:3:1.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic constitution of an organism, while phenotype refers to the observable traits.