Other forms of Inheritance

Question 1

What is incomplete dominance?

Answer 1

Neither allele is completely dominant, leading to a blended trait.

Example: Red (R) + White (r) = Pink (Rr) in flowers.

Question 2

What is an example of incomplete dominance in humans?

Answer 2

Wavy hair (from a straight-haired and curly-haired parent).

Question 3

What is co-dominance?

Answer 3

Both alleles are expressed equally.

Example: A red (R) and white (W) flower produces red-and-white-spotted flowers.

Question 4

What is an example of co-dominance in animals?

Answer 4

Roan cows (red-and-white fur pattern).

Question 5

What are sex-linked traits?

Answer 5

Traits controlled by genes on the X and Y chromosomes.

Example: Color blindness.

Question 6

Why are males more likely to inherit sex-linked diseases?

Answer 6

Males have only one X chromosome, so they only need one recessive allele to express the trait.

Question 7

What is a carrier?

Answer 7

A person who has one recessive allele for a trait but does not express it.

Example: XCX for color blindness.

Question 8

Can two carriers have affected offspring?

Answer 8

Yes, if both pass on the recessive allele.