As a commercial chinchilla breeder, you have been breeding and selling white sho

Question

As a commercial chinchilla breeder, you have been breeding and selling white
short-haired chinchillas for several years, but the current chinchilla market is
shifting toward a preference for long-haired chinchillas. In order to keep up with
market forces, you use nefarious methods to acquire a white long-haired chinchilla
stud (male) from a rival’s true-breeding line. Your plan is to mate this male with
your white short-haired females (also true-breeding) and attempt to create your
own line of white long-haired animals. However, the progeny from the mating are
surprising in that all of the F1s have grey short hair. You stare at these unexpected
furballs dejectedly - as you probably already know, nobody wants a grey chinchilla
in 2010.

a. Provide a likely mode of inheritance for these traits, giving genotypes for the
parents and the F1.

b. According to your model in (a), if F1 siblings are mated, what proportion of the F2
progeny will have the desired phenotypes of white long hair?

c. What proportion of the progeny will have the desired phenotypes if an F1 female
is crossed to the parental white long-haired male?

Explanation / Answer

a. short and gray are dominant over white and long hair b. 25% since the while long hair is recessive and each offspring has a 50% chance of inheriting that gene from each parent and 50%^2 is 25% c. 50% since we have a 100% chance of getting the long haired gene from the male and 50% of getting the gene from the F1 female

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.