REVIEW Unit 6: Genetic Variation and Evolution

Generally, mutations that affect a single gene occur during which step? Choose the correct answer.

• operation

• translation

• replication

• transcription

Tags

NGSS.HS-LS3-2

Which type of mutation has no effect on phenotype? Choose the correct answer.

• point

• silent

• frameshift

• chromosomal

What is the name for a mutation caused by a piece of DNA breaking away from its chromosome and becoming attached to a nonhomologous chromosome? Choose the correct answer.

• • deletion

• • inversion

• • duplication

• • translocation

Nondisjunction causes which of the following? Choose the correct answer.

• • extra gene

• • extra codon

• • extra chromosome

• • extra nitrogen base

Genetic variation can arise from a random change in the DNA of a gene. What is the name for this type of change? Choose the correct answer.

• • allele

• • mutation

• • gene flow

• • gene pool

Tags

NGSS.HS-LS3-2

Cystic fibrosis is an example of a genetic disease caused by the deletion of a nucleotide. What is the term for this type of mutation? Choose the correct answer.

Responses

• 
  

• • frameshift

• • single-gene

• • translocation

• • chromosomal

Tags

NGSS.HS-LS3-2

Mutations that can affect the offspring of an organism occur in what cell type? Choose the correct answer.

• • body

• germ

• brain

• blood

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of these is an example of a mutagen? Choose the correct answer.

• • thymine

• • triglyceride

• • UV sunlight

• • repair enzyme

Tags

NGSS.HS-LS3-2

Which phrase describes the consequence that results from nondisjunction? Choose the correct answer.

• • Mitosis cannot take place.

• • No gametes will be produced.

• • There will be too many gametes produced.

• • A gamete will receive too many or too few copies of a chromosome.

Tags

NGSS.HS-LS3-2

Which of these describes the number of chromosomes found in people who have Down syndrome? Choose the correct answer.

• 45 chromosomes

• 46 chromosome

• 47 chromosomes

• no X chromosome