The Human Genome

Gel electrophoresis enables scientists to

• separate DNA fragments.
• combine DNA fragments.
• count the genes in DNA.
• insert DNA in cells.

Polymerase chain reaction is used to

• determine the sequence of DNA.
• make copies of a DNA sequence.
• selectively breed plants and animals.
• produce mutations in bacteria.

How many chromosomes are found in each diploid cell of a person with Down syndrome?

• 47
• 45
• 22
• 24

Sex-linked recessive traits occur

• more often in males
• because of genes on chromosome 21.
• more often in females
• because of genes on autosomes

Tags

NGSS.HS-LS3-1

Whether a human will be a male or a female is determined by

• sex chromosomes in the egg cell.
• sex chromosomes in the sperm cell.
• autosomes in the egg cell.
• autosomes in the sperm cell.

Tags

NGSS.HS-LS3-1

A chromosome that is not a sex chromosome is known as a(an)

• autosome.
• karyotype.
• pedigree.
• chromatid.

Tags

NGSS.HS-LS3-1

An individual with blood type O can receive blood from an individual with type

• A
• B
• AB
• O

The ABO blood group is made up of

• three alleles.
• two alleles.
• identical alleles.
• dominant alleles.

Tags

NGSS.HS-LS3-2

How are scientists able to amplify DNA fragments?

• PCR
• STR
• RNA
• CSI

Why does DNA migrate toward the positive electrode?

• DNA is positive
• DNA is negative
• DNA is short
• DNA is long