Genetics

Front

What is the genotypic ratio in a monohybrid cross?

Back

The genotypic ratio is the ratio of homozygous dominant, heterozygous, and homozygous recessive offspring. For a monohybrid cross of two heterozygous parents (Bb x Bb), the genotypic ratio is 1:2:1.

Front

What is the phenotypic ratio in a monohybrid cross of two heterozygous plants?

Back

The phenotypic ratio is the ratio of different observable traits. In a monohybrid cross of two heterozygous plants (Tt x Tt), the phenotypic ratio is 3:1 (3 tall: 1 short).

Front

Define homozygous dominant.

Back

Homozygous dominant refers to an organism that has two identical dominant alleles for a trait (e.g., BB).

Front

Define homozygous recessive.

Back

Homozygous recessive refers to an organism that has two identical recessive alleles for a trait (e.g., bb).

Front

Define heterozygous.

Back

Heterozygous refers to an organism that has two different alleles for a trait (e.g., Bb).

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genotypes of offspring from a genetic cross.

Front

What is the probability of a blue-eyed baby from two brown-eyed parents (Bb)?

Back

The probability of a blue-eyed baby (bb) from two brown-eyed parents (Bb) is 25%.

Front

What does the term 'allele' mean?

Back

An allele is a variant form of a gene that can produce different traits.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism (e.g., BB, Bb, bb), while phenotype refers to the observable traits (e.g., brown eyes, blue eyes).

Front

What is a monohybrid cross?

Back

A monohybrid cross is a genetic cross between parents that differ in a single trait.