Genetics & Punnett Squares

Front

What are alleles?

Back

Alleles are different forms of a gene that can exist at a specific locus on a chromosome.

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What does homozygous mean?

Back

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

Front

What does heterozygous mean?

Back

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

Front

What is a genotype?

Back

The genotype is the genetic make-up of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

The phenotype is the physical expression or characteristics of a genotype, such as color or shape.

Front

What is Mendelian inheritance?

Back

Mendelian inheritance is the pattern of inheritance that follows the laws established by Gregor Mendel, including the segregation and independent assortment of alleles.

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.

Front

If A = red fur and a = white fur, what color fur would Aa be?

Back

Aa would have red fur, as red (A) is dominant over white (a).

Front

What is the phenotypic ratio of a cross between two heterozygous parents (Aa x Aa)?

Back

The phenotypic ratio is 3:1 (3 red fur: 1 white fur).

Front

What is the genotypic ratio of a cross between two heterozygous parents (Aa x Aa)?

Back

The genotypic ratio is 1:2:1 (1 AA: 2 Aa: 1 aa).