Genotypes and Phenotypes

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by the alleles inherited from the parents.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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 does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Aa.

Front

What is a recessive allele?

Back

A recessive allele is an allele that is only expressed in the phenotype when two copies are present (homozygous recessive).

Front

What is a dominant allele?

Back

A dominant allele is an allele that is expressed in the phenotype even when only one copy is present (heterozygous).

Front

What is the significance of the 'dd' genotype?

Back

The 'dd' genotype indicates a homozygous recessive condition, which typically results in a recessive phenotype.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What does the 'bb' genotype represent?

Back

The 'bb' genotype represents a homozygous recessive condition for a specific trait.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is the relationship between genotype and phenotype?

Back

The genotype determines the potential phenotype, but environmental factors can also influence the expression of the phenotype.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is an example of a recessive phenotype?

Back

Examples of recessive phenotypes include traits like blue eyes or certain genetic disorders, which only appear when the individual is homozygous recessive.