3) (2 pts) Among dogs, short hair (A) is dominant to long hair (a) and dark coat

Question

3) (2 pts) Among dogs, short hair (A) is dominant to long hair (a) and dark coat color (B) is dominant to white (albino) coat color (b). Assume that these two coat traits are caused by independently segregating gene pairs. For each of the crosses given below, below each cross, write the most probable genotype (or genotypes if more than one answer is possible) for the parents Parental Phenotypes Phenotypes of Offspring Short Long Short Long Dark Dark AlbinoAlbino 26 24 (a) dark, short dark, long (b) albino, short x albino, short (c) dark, short x albino, short 0 0 102 16 16 175 67 61 21 (d) dark, short x dark, short

Explanation / Answer

short hair(A) is dominant over long hair (a) and dark coat color (B) is dominant over albino (b)

a) dark, short * dark, long (BB, Aa * BB, aa)

b) albino,short * albino short (short albino , long albino)

(bb ,Aa * bb, Aa) parental genotypes = bA bA , babA , bA ba , ba ba (progeny)

c) dark, short * albino, short (short dark and short albino progeny)

AA, Bb* aa,AA

d) dark,short * dark short (short dark, long dark, short albino, long albino)

Bb,Aa* Aa ,Bb (parental genotypes)

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