Phenotype vs Genotype

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.

Front

What is a genotype?

Back

The genetic constitution of an individual, specifically the alleles present at a particular gene locus.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., AA or aa).

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Aa).

Front

What is the difference between dominant and recessive alleles?

Back

A dominant allele masks the effect of a recessive allele in a heterozygous genotype.

Front

What is an example of a phenotype?

Back

A flower's color, such as red or yellow.

Front

What is the genotype for a homozygous recessive individual?

Back

The genotype consists of two recessive alleles (e.g., aa).

Front

If yellow is dominant to blue, what is the phenotype of a plant with genotype Yy?

Back

The phenotype is yellow, as the dominant allele masks the recessive one.

Front

What is the genotype for a heterozygous individual for a trait?

Back

The genotype consists of one dominant and one recessive allele (e.g., Aa).

Front

What does it mean if an organism is homozygous dominant?

Back

It has two dominant alleles for a trait (e.g., AA).