Question

Part A

Multiple Select Question

Which statement best describes how humans select for wrinkly skin in Chinese Shar Peis?

A. 

By mating a very wrinkly female and non-wrinkly male so they have the best chance of passing on the gene for wrinkly skin.

B. 

By mating a wrinkly female and wrinkly male so they have the best chance of passing on the gene for wrinkly skin.

C. 

By inserting a gene for wrinkly skin into every Shar Pei puppy.

D. 

By mutating the DNA of one Shar Pei, hoping they will pass on the mutated trait to their offspring.

Part B

Multiple Select Question

Chinese Shar Peis are selectively bred for their recessive trait, the wrinkly coat. The genotypic relationship of (rr) represents pure recessive genes. What would the alleles of the parents need to be in order to pass those traits to at least 25% of the offspring? Select three that apply:

A. 

RR, RR

B. 

Rr, Rr

C. 

RR, rr

D. 

Rr, rr

E. 

rr, rr

Answer 1

### Part A

The best statements that describe how humans select for wrinkly skin in Chinese Shar Peis are:

**B.** By mating a wrinkly female and wrinkly male so they have the best chance of passing on the gene for wrinkly skin.

**D.** By mutating the DNA of one Shar Pei, hoping they will pass on the mutated trait to their offspring. (This could apply in some breeding practices, though it's not the most common or ethical method.)

### Part B

To pass on the wrinkly trait (rr) to at least 25% of the offspring, the parents would need the following alleles:

**B.** Rr, Rr
**D.** Rr, rr
**E.** rr, rr

These combinations can result in at least 25% of the offspring exhibiting the recessive trait (wrinkly skin).