Review Flashcardzizz: Patterns of Inheritance - Chromosomes

Front

What is a dominant allele?

Back

Symbolized by a capital letter, its trait will always appear in an organism if the allele is present in the genotype.

Front

What is co-dominance in inheritance?

Back

A pattern of inheritance where both alleles in a heterozygous organism contribute to the phenotype.

Front

What is a recessive allele?

Back

An allele that is hidden whenever a dominant allele is present; it can only be expressed in a homozygous pairing.

Front

How many chromosomes are in an adult human body cell?

Back

46 chromosomes.

Front

How many chromosomes do human sperm and egg cells have?

Back

23 chromosomes.

Front

What is the symbol for a dominant allele?

Back

A capital letter.

Front

What is the symbol for a recessive allele?

Back

A lowercase letter.

Front

What does a Punnett Square illustrate?

Back

The possible genetic combinations from a cross between two organisms.

Front

What is incomplete dominance?

Back

A pattern of inheritance where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes.

Front

What is the purpose of a test cross?

Back

To determine the genotype of an organism showing a dominant phenotype.