Genetics Review

Front

What is the definition of homozygous recessive?

Back

An organism that has two identical recessive alleles for a trait (e.g., aa).

Front

What is the role of DNA in genetics?

Back

DNA stores all genetic information and instructions for the development and functioning of living organisms.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What does a Punnett square illustrate?

Back

A Punnett square is a diagram used to predict the genetic outcomes of a cross between two organisms.

Front

What is the phenotype?

Back

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

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait, while heterozygous means having two different alleles.

Front

What is meiosis?

Back

Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four daughter cells, each with half the number of chromosomes of the parent cell.

Tags

NGSS.HS-LS3-2

Front

What is the expected phenotype ratio from a monohybrid cross?

Back

The expected phenotype ratio is typically 3:1 for dominant to recessive traits.

Tags

NGSS.HS-LS3-3

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its phenotype even when only one copy is present (e.g., A in Aa).

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its phenotype when two copies are present (e.g., aa).

Front

How many chromosomes do humans have?

Back

Humans have 46 chromosomes, arranged in 23 pairs.