2-Phenotype and Genotype

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 both its genotype and environmental influences (e.g., blue color of a beta fish).

Front

What does it mean if an allele is dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype (e.g., 'D' in 'Dd').

Front

What does it mean if an allele is recessive?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype (e.g., 'ff' must be 'ff' to show the recessive trait).

Front

Provide an example of a genotype.

Back

Examples of genotypes include: DD, Ee, Aa, bb, yy.

Front

Provide an example of a phenotype.

Back

Examples of phenotypes include: blue color in beta fish, tall plants, or brown eyes.

Front

What is the relationship between genotype and phenotype?

Back

The genotype determines the potential traits (phenotype) of an organism, but the phenotype can also be influenced by environmental factors.

Front

What is the significance of the letters in genotypes?

Back

Letters represent alleles; uppercase letters indicate dominant alleles, while lowercase letters indicate recessive alleles.

Front

What is the genotype for a homozygous dominant organism?

Back

The genotype for a homozygous dominant organism is represented by two identical dominant alleles (e.g., AA or DD).

Front

What is the genotype for a homozygous recessive organism?

Back

The genotype for a homozygous recessive organism is represented by two identical recessive alleles (e.g., aa or ff).