Genetics

Front

What is genetics?

Back

Genetics is the scientific study of heredity, which is how traits are passed from parents to offspring.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is a dominant allele?

Back

A dominant allele is a version of a gene that can mask the effect of a recessive allele. For example, in pea plants, the round seed shape (R) is dominant over the oval shape (r).

Front

What is a recessive allele?

Back

A recessive allele is a version of a gene that is masked by a dominant allele. It only shows its effect if an individual has two copies of it.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Rr for seed shape.

Tags

NGSS.HS-LS3-2

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as RR or rr.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

What is the probability of getting a round child from two heterozygous round parents?

Back

The probability is 75%.

Tags

NGSS.HS-LS3-3

Front

What is the F2 generation in Mendelian genetics?

Back

The F2 generation is the second filial generation, which is produced by crossing two F1 individuals.

Front

What is the expected phenotypic ratio in the F2 generation of a monohybrid cross?

Back

The expected phenotypic ratio is 3:1, where 3 are dominant and 1 is recessive.

Front

What is the expected genotypic ratio in the F2 generation of a monohybrid cross?

Back

The expected genotypic ratio is 1:2:1, representing homozygous dominant, heterozygous, and homozygous recessive.