Genotypes and Phenotypes in Genetics

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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).

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-2

Front

What is a phenotype?

Back

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

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., AA or aa).

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What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Aa).

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What is a dominant allele?

Back

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

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What is a recessive allele?

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

Front

What is the phenotype of an organism with the genotype 'AA'?

Back

The phenotype is a dominant trait.

Tags

NGSS.HS-LS3-1

Front

What is the phenotype of an organism with the genotype 'aa'?

Back

The phenotype is a recessive trait.

Tags

NGSS.HS-LS3-1

Front

Can a homozygous recessive genotype produce a dominant phenotype?

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No, a homozygous recessive genotype cannot produce a dominant phenotype.

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What is the result of crossing a homozygous dominant organism with a heterozygous organism?

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All offspring will display the dominant phenotype.