Genes and Alleles

Front

What is a gene?

Back

A piece of DNA that codes for a trait.

Tags

NGSS.HS-LS3-1

Front

What is an allele?

Back

A variant form of a gene that can produce different traits.

Tags

NGSS.HS-LS3-2

Front

What is a trait?

Back

An observable characteristic of an organism.

Tags

NGSS.HS-LS3-1

Front

What is a phenotype?

Back

The physical expression or characteristics of a trait.

Tags

NGSS.HS-LS4-4

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by letters (e.g., Tt, BB).

Tags

NGSS.HS-LS1-1

Front

What is a chromosome?

Back

A structure made of DNA and proteins that contains genes.

Tags

NGSS.HS-LS3-1

Front

What is a chromatid?

Back

One half of a duplicated chromosome.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup, while phenotype refers to the observable traits.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., TT or tt).

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Tt).