IB Biology Topic 3.2

A heritable factor that consists of a length of DNA

and influences a specific characteristic is called a:

• chromatid

• chromosome

• plasmid

• gene

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

There are 23 different types of chromosomes in humans. Each gene occupies a specific position on the type of chromosome where

it is located. This position is called the _____ of the gene.

The mutation that results in the Hb^S allele causes an mRNA codon in the 6th codon of the alpha-globin polypeptide to change from:

• CTC --> CAC

• GAG --> GUG

• CUC --> CAC

• GUG--> GAG

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NGSS.HS-LS3-2

The mutation that causes sickle-cell anemia results in the replacement of the amino acid _______, with ________.

• glutamic acid, valine

• valine, glutamic acid

• leucine, isoleucine

• isoleucine, leucine

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NGSS.HS-LS1-1

NGSS.HS-LS3-2

The prokaryotic genome consists of:

• DNA in the circular chromosome and DNA from mitochondria

• DNA in chromosomes, chloroplasts and mitochondria

• DNA in the circular chromosomes and DNA from plasmids.

• DNA in the chromosomes only.

Approximately how many base sequences in the human genome are protein coding genes?

• 60,000

• 100,000

• 23,000

• 32,000

Most mutations:

• are neutral or harmful

• Are predictable

• are passed down to the next generation

• Are beneficial

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NGSS.HS-LS3-2

NGSS.HS-LS4-2

A heritable factor that consists of a length of DNA

and influences a specific characteristic is called:

• an allele

• a gene

• a chromatid

• a chromosome

Tags

NGSS.HS-LS3-1

Which of the following traits is determined by multiple alleles for a single gene?

• eye color

• height

• hair color

• blood type

DNA in prokaryotes:

• is arranged in linear chromosomes

• occurs in homologous pairs

• is associated with histones

• is arranged as a single, circular chromosome.