Punnett Squares

Front

What is a dominant trait?

Back

A dominant trait is a genetic characteristic that is expressed in the offspring even if only one parent contributes the allele for that trait. For example, yellow pea seeds are a dominant trait over green pea seeds.

Front

What does a Punnett Square do?

Back

A Punnett Square is a tool used in genetics to predict the genotypes and phenotypes of offspring based on the genetic makeup of the parents.

Front

What is the genotype of a homozygous dominant organism?

Back

The genotype of a homozygous dominant organism consists of two identical dominant alleles, such as 'MM'.

Front

What is the genotype of a heterozygous organism?

Back

The genotype of a heterozygous organism consists of one dominant and one recessive allele, such as 'Bb'.

Front

What does it mean if an organism is homozygous recessive?

Back

An organism is homozygous recessive if it has two identical recessive alleles, such as 'bb'.

Front

In a Punnett Square, what do the letters represent?

Back

The letters in a Punnett Square represent the alleles contributed by each parent. Uppercase letters indicate dominant alleles, while lowercase letters indicate recessive alleles.

Front

What is the purpose of using a Punnett Square?

Back

The purpose of using a Punnett Square is to visualize and predict the possible genetic combinations of offspring from two parents.

Front

If two black mice (Bb) mate, what are the possible genotypes of their offspring?

Back

The possible genotypes of their offspring are BB, Bb, and bb.

Front

What is the phenotype ratio of offspring from a Bb x Bb cross?

Back

The phenotype ratio of offspring from a Bb x Bb cross is 3 black (dominant) to 1 brown (recessive).

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism (the alleles), while phenotype refers to the observable traits or characteristics of that organism.