Dominant and Recessive Traits Flashcard

Front

What is a dominant trait?

Back

A dominant trait is a genetic characteristic that is expressed in the phenotype even when only one copy of the allele is present. For example, yellow pea seeds are a dominant trait.

Front

What can be inferred about the parents' genotypes if a child has a recessive trait?

Back

Both parents must carry at least one recessive allele.

Front

What allele masks (takes precedence over) the other allele in a hybrid?

Back

Dominant allele.

Front

What is the term for the physical appearance of an organism?

Back

Phenotype.

Front

What is the term for the genetic makeup of an organism?

Back

Genotype.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene.

Front

What is a recessive trait?

Back

A recessive trait is a genetic characteristic that is only expressed in the phenotype when two copies of the allele are present.

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What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

Front

What is polygenic inheritance?

Back

Polygenic inheritance is a type of inheritance where multiple genes influence a single trait.