5/2018 11:55 PM 53.2/100 2/5/2018 09:56 PM Grad -Print Calculator on 11 of 15 Ma

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5/2018 11:55 PM 53.2/100 2/5/2018 09:56 PM Grad -Print Calculator on 11 of 15 Map Sapling Learning In purebred Labrador retrievers, the dominant fur-color allele, B, results in black fur, and the recessive allele, b, results in yellow fur. Suppose the Happy Labrador Ranch breeds yellow and black Labrador retrievers. The Ranch is expecting a new litter of four puppies, and the owners want to calculate the probability that the puppies will be either all-black or two will be black and two will be yellow. The parents of the new litter are both black and heterozygous, Bb, for coat color. Calculate the probability that the new puppies will be either all-black or two will be black and two will be yellow. Enter the probability as a decimal rounded to the nearest thousandth. Number BB or Bb

Explanation / Answer

B: dominant allele for black
b: recessive allele for yellow
Parents: heterozygous black (Bb)

The cross:
P: black (Bb) x black (Bb)
Gamete: (B, b) (B, b)
F1: 1/4 BB : 1/2 Bb : 1/4 bb or 3/4 black : 1/4 yellow (3 black and 1 yellow)

The probability of four puppies
1. All black = 3/4 x 3/4 x 3/4 x 3/4 = 81/256 = 0.3164
2. 2 black and 2 yellow = 3/4 x 3/4 x 1/4 x 1/4 = 9/256 = 0.0351

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