Punnett Squares Flashcards

Questions and Answers

What is a Punnett Square?

A chart that shows all the possible combinations of alleles that can result from a genetic cross (correct)

A type of allele

A method for cloning organisms

A type of genetic disorder

What is a dominant allele?

An allele whose trait always shows up in the organism when the allele is present.

What is a recessive allele?

An allele that is hidden whenever the dominant allele is present.

What does homozygous dominant mean?

Both alleles for a trait are the same and dominant (AA). Signup and view all the answers

What does heterozygous mean?

When one trait is dominant and the other is recessive (Tt). Signup and view all the answers

What does homozygous recessive mean?

Both alleles for a trait are the same and recessive (aa). Signup and view all the answers

What is a phenotype?

An organism's physical appearance, or visible traits. Signup and view all the answers

What is a genotype?

The allele combination for a trait. Signup and view all the answers

Study Notes

Punnett Squares

A Punnett Square is a diagram used to predict the genetic combinations resulting from a cross between two organisms.
It illustrates the possible allele combinations and their probabilities.

Dominant Alleles

Dominant alleles are expressed in an organism's phenotype whenever present.
Represented using uppercase letters (e.g., A).

Recessive Alleles

Recessive alleles are masked by dominant alleles and do not manifest unless present in a homozygous state.
Represented using lowercase letters (e.g., a).

Homozygous Dominant

An organism with two identical dominant alleles for a trait (e.g., AA) is referred to as homozygous dominant.
It guarantees the dominant phenotype will be expressed.

Heterozygous

An organism with one dominant and one recessive allele (e.g., Tt) is heterozygous.
Displays the dominant trait while carrying the recessive allele.

Homozygous Recessive

An individual that has two identical recessive alleles for a trait (e.g., aa) is classified as homozygous recessive.
Can only express the recessive phenotype.

Phenotype

Refers to the observable characteristics or traits of an organism, resulting from the genotype.
Examples include flower color, height, and seed shape.

Genotype

The genotype is the specific combination of alleles (e.g., AA, Aa, aa) an organism possesses.
Determines the potential phenotypic expressions of traits.

Description

This quiz consists of flashcards focused on Punnett squares and genetic terminology. Explore key terms like dominant and recessive alleles and their definitions. Perfect for revising genetic concepts in biology.