Chromosomes, Genes and Alleles

A segment of DNA that codes for a trait

• gene

• allele

• chromosome

• chromatid

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

an observable characteristic

• trait

• gene

• allele

• DNA

Tags

NGSS.HS-LS3-1

Genetic traits are determined by one or more

• genes

• chromosomes

• random chances

• cells

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A version or variation of a gene

• trait

• gene

• allele

• DNA

The alleles that an organism has

• genotype

• phenotype

• chromosome

• recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The observable expression of a trait

• phenotype

• genotype

• chromosome

• allele

Tags

NGSS.HS-LS1-1

When an organism has two of the same alleles, it is called

• homozygous

• heterozygous

• recessive

• dominant

When an organism has two different alleles, it is called

• homozygous

• heterozygous

• recessive

• dominant

This type of allele is expressed whether there are one or two copies present.

• dominant

• recessive

• homozygous

• heterozygous

These types of alleles are only expressed if the organism has two copies

• dominant

• recessive

• homozygous

• heterozygous