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In cocker spaniels, black is a dominant trait (B), red is recessive (b). Solid color is dominant (D) and white spotting is recessive (s). A red male was mated to a black-and-white female. They had five puppies as follows: 1 black, 1 red, 1 black-and-white, and 2 red-and-white. What are the genotypes of the parents?

I was reading this and i tried solving it. I attempted to use a punnett square (4x4) and place the traits there.. but i kind of got lost. I was wondering if you could help me solve this problem-- i'd greatly appreciate it!

2007-11-07 14:24:28 · 1 answers · asked by Anonymous in Science & Mathematics Biology

Rhe solid coloring symbol is actually S not D. That was my mistake.

2007-11-07 14:25:25 · update #1

1 answers

Red male is red (bb) and solid (S_).
Black and white female is black (B_) and spotted (ss).

Now look at the offspring for clues to fill in the blanks for the parents. There are red offspring, so each parent had to donate a b. That means the female must have been Bb. There are spotted offspring, so each parent had to donate an s. That means that the male had to be Ss. That fills in both of the blanks.

Parents: bbSs x Bbss

2007-11-07 14:41:45 · answer #1 · answered by ecolink 7 · 0 0

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