Genetics and Heredity Review (Lesson 5)

Front

What is a homozygous allele?

Back

An allele that has identical pairs of genes for any given hereditary characteristic (e.g., TT or tt).

Front

What does homozygous recessive mean?

Back

It refers to having two identical recessive alleles for a trait (e.g., tt).

Front

What is a homozygous dominant genotype?

Back

A genotype where both alleles are dominant (e.g., BB, AA, TT).

Front

What does it mean when alleles are homozygous?

Back

It means the alleles are the same for a particular gene.

Front

What is the genotype of an individual with oval eyes if round eyes are dominant?

Back

The genotype is rr.

Front

What is codominance in genetics?

Back

Codominance occurs when both alleles in a heterozygous genotype are fully expressed (e.g., a roan cow with brown and white fur).

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.

Front

What is a genotype?

Back

The genetic constitution of an individual, specifically the alleles present for a particular gene.

Tags

NGSS.HS-LS1-1

Front

What is the expected phenotype ratio in offspring from a roan cow (BW) mating with another roan cow (BW)?

Back

1 Brown, 2 Brown and White, 1 White.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their traits even when only one copy is present, while recessive alleles only express their traits when two copies are present.

Tags

NGSS.HS-LS3-2