Chromosomal Inheritance

The crossover frequency between genes E and F is 6%, between E and G is 10% and
between F and G is 4%. What is the correct order of the genes on a chromosome?

• E - F - G
• F - E - G
• F - G - E
• E - G - F

Tags

NGSS.HS-LS3-3

In Drosophila, the genes for eye colour (pr), wing shape (vg), and body colour (eb) are all found on the same chromosome. The following crossover frequencies for these genes were determined by experimentation. Determine the sequence of genes on the chromosome.

• eb - vg - pr
• vg - eb - pr
• vg - pr - eb
• pr- vg - eb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

If a normal woman carrying the recessive sex linked gene for color blindness marries a normal male, what percentage of their sons will be color blind?

• 0%
• 25%
• 50%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Baldness is a recessive sex-linked trait. If a normal headed woman, whose father is bald, has children with a normal headed man, then which of the following would be true regarding their offspring?

• 50% chance of a female with baldness
• 100% chance of a male with baldness
• 50% chance of offspring with baldness
• 50% chance male offspring will be bald

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In 1911, Thomas Morgan collected the following crossover gene frequencies while studying Drosophila. Bar-shaped eyes are indicated by the B allele, and carnation eyes are indicated by the allele C. Fused veins on wings (FV) and scalloped wings (S) are also located on the same chromosome. What would be the gene map?

• C - B - FV - S
• FV - S - B - S
• C - FV - B - S
• C - B - S - FV

Tags

NGSS.HS-LS4-3

In humans, hemophilia is a sex linked recessive trait. Females can be normal, carriers, or have the disease. Males will either have the disease or not (but they won’t ever be carriers). A woman who is a carrier marries a normal man. What is the probability that their children will have hemophilia?

• 0%
• 25%
• 50%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Sex determination in mammals is determined by the ______ in the _______ chromosome.

• SRY gene; X 
• SRY gene; Y
• HERC2; 15
• BRCA1; 6

Which of the following distances between linked genes would have the greatest chances of crossing over?

• 22 map units
• 10 map units
• 15 map units
•  2 map units

What would we expect to happen in a test cross which involved genes that were closely linked?

• There would be a higher frequency of recombination.
• The offspring would show more individuals that represented the parents.
• The offspring would less individuals that represented the parents.
• The genes would assort themselves as if they were on separate chromosomes.

Which of the following statements is correct regarding aneuploidies.

• A person with an extra X chromosome would have more severe conditions than a person with an extra 21st chromosome
• Chromosomal abnormalities involving nondisjunction are fairly common.
• People with Turner's Syndrome (X0) don't tend to survive to adulthood.
• The chances of nondisjunction during meiosis increases with age.