Genotype, Phenotype, & Punnett Squares

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., AA, Aa, aa).

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype and environment.

Front

What does dominant allele mean?

Back

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

Front

What does recessive allele mean?

Back

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

Front

In a heterozygous genotype, which allele is expressed in the phenotype?

Back

The dominant allele is expressed in the phenotype.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genetic outcomes of a cross between two organisms.

Front

If a pea plant's genotype is 'yy', what is its phenotype?

Back

The phenotype will be green seeds.

Front

What is the probability of offspring having a recessive trait from two heterozygous parents?

Back

The probability is 25%.

Front

What does it mean if an organism is homozygous?

Back

An organism is homozygous if it has two identical alleles for a particular trait (e.g., AA or aa).

Front

What does it mean if an organism is heterozygous?

Back

An organism is heterozygous if it has two different alleles for a particular trait (e.g., Aa).