Help with some homework questions please? (show work if you could) 4. Yellow see

Question

Help with some homework questions please? (show work if you could)

4. Yellow seed color (Y) in garden peas is dominant to green seed color (y). Study the table below. The parents have known phenotypes, but unknown genotypes and produced the progeny listed. What are the genotypes of the parents in each cross? # Progeny Parents Female x Male 1. yellow x yellow 2. yellow x green 3. yellow x yellow 4. yellow x green Yellow Green 150 93 132 87 87 5. Black coat color in dogs is dominant over brown. If you cross two heterozygous dogs, what are the following probabilities? . a. The first puppy is brown and the next 2 puppies are black. . b. The first puppy is black, the next two are brown and the 4th one is black.

Explanation / Answer

4.
Yellow = Dominant = YY or Yy
Green = Recessive = yy

a.
Yellow X Yellow = All Yellow progeny.
Parental cross: YY X YY or Yy X YY

b.
Yellow X Green = All Yellow progeny.
Parental cross: YY X yy

c.
Yellow X Yellow = 3:1 ratio of yellow and green progeny.
Parental cross: Yy X Yy

d.
Yellow X Green = 1:1 ratio of yellow and green progeny.
Parental cross: Yy X yy

5.
Black coat color = Dominant = BB or Bb
Brown coat color = Recessive = bb

Parental cross: Bb X Bb
Progeny: BB Bb Bb bb
Probability for black puppy = 3/4
Probability for brown puppy = 1/4

a.
Probability for the first puppy to be brown and the next two puppies black = 1/4 X 3/4 X 3/4 = 9/64

b.
Probability for the first puppy to be black and the next two puppies brown and the fourth one is black = 3/4 X 1/4 X 1/4 X 3/4 = 9/256

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