Lesson 3- Genes and Alleles

Front

What is a segment of DNA that codes for a trait?

Back

gene

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is the genotype Aa best described as?

Back

heterozygous

Front

In pea plants, what is the phenotype of a Pp plant?

Back

purple

Tags

NGSS.HS-LS3-1

Front

What type of allele is expressed whether there are one or two copies present?

Back

dominant

Front

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

Back

recessive

Front

What is the term for the physical appearance of an organism?

Back

phenotype

Front

What is the term for the genetic makeup of an organism?

Back

genotype

Tags

NGSS.HS-LS1-1

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous has two identical alleles; heterozygous has two different alleles.

Front

What is an allele?

Back

An alternative form of a gene.

Tags

NGSS.HS-LS3-2

Front

What does it mean if an allele is dominant?

Back

It means the allele will express its trait even if only one copy is present.

Tags

NGSS.HS-LS3-1