Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from two parents based on their allele combinations.

Front

What does the term 'allele' mean?

Back

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

Front

What is the difference between a dominant allele and a recessive allele?

Back

A dominant allele is expressed in the phenotype even when only one copy is present, while a recessive allele is only expressed when two copies are present.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, specifically the alleles present for a particular gene.

Front

How do you determine the probability of an offspring's genotype using a Punnett Square?

Back

By filling in the Punnett Square with the alleles from each parent, you can calculate the ratio of possible genotypes for the offspring.

Front

What does it mean if an organism is homozygous for a trait?

Back

An organism is homozygous for a trait if it has two identical alleles for that trait, either dominant or recessive.

Front

What does it mean if an organism is heterozygous for a trait?

Back

An organism is heterozygous for a trait if it has two different alleles for that trait, one dominant and one recessive.

Front

What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygous organism are fully expressed, resulting in a phenotype that shows both traits.

Front

What is the expected phenotype ratio for a monohybrid cross between two heterozygous parents?

Back

The expected phenotype ratio is 3:1, where 3 offspring show the dominant trait and 1 shows the recessive trait.