Genes and Alleles

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.

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What is a recessive allele?

Back

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

Front

What does genotype refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses.

Front

What does phenotype refer to?

Back

Phenotype refers to the observable characteristics or traits of an organism, influenced by its genotype.

Front

What is an allele?

Back

An allele is a version or variation of a gene that can produce different traits.

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 the relationship between genes and alleles?

Back

A gene is a segment of DNA that codes for a trait, while alleles are the different versions of that gene.

Front

In pea plants, what is the phenotype of a plant with genotype PP?

Back

The phenotype of a plant with genotype PP is purple flowers.

Front

What is the significance of the Punnett square?

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The Punnett square is a tool used to predict the genotypes and phenotypes of offspring from genetic crosses.