Punnett Squares

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

What does it mean for an allele to be dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does it mean for an allele to be recessive?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype.

Front

What is the genotype of a homozygous dominant organism?

Back

The genotype of a homozygous dominant organism consists of two identical dominant alleles, represented as 'AA'.

Front

What is the genotype of a heterozygous organism?

Back

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

Front

In a genetic cross, what does the term 'phenotype' refer to?

Back

Phenotype refers to the observable physical characteristics or traits of an organism, determined by its genotype.

Front

In a genetic cross, what does the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it carries.

Front

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous parents?

Back

The expected phenotypic ratio is 3:1, where three offspring exhibit the dominant trait and one exhibits the recessive trait.

Front

How do you determine the probability of a specific phenotype in a Punnett Square?

Back

To determine the probability of a specific phenotype, count the number of squares that show that phenotype and divide by the total number of squares.

Front

What is the expected genotypic ratio of a monohybrid cross between two heterozygous parents?

Back

The expected genotypic ratio is 1:2:1, representing one homozygous dominant, two heterozygous, and one homozygous recessive.