In horses, black color (B) dominates chestnut color (b). The trotting gait (T) dominates the pacing gait (t).?

A cross is made between a horse homozygous for black color and the pacing gait and a horse homozygous for chestnut color and the trotting gait. List the probable genotype and phenotype of offspring resulting from such a cross?





List the probable phenotypes of offspring that could result if the offspring from the original cross were crossed themselves.

In horses, black color (B) dominates chestnut color (b). The trotting gait (T) dominates the pacing gait (t).?
Cross between homozygous black, pacing [BBtt] and homozygous chestnut, trotting [bbTT] - BBtt X bbTT


- All offspring will have heterozygous genotype [BbTt] which means they will phenotypically be black, trotting since the dominant alleles determine the outward appearance





The heterozygous dihybrid cross - BbTt X BbTt


produce the classic phenotypic ratio 9:3:3:1


9/16 are black [BB or Bb] and trotting [TT or Tt]


3/16 are black [BB or Bb] and pacing [tt]


3/16 are chestnut [bb] and trotting [TT or Tt]


1/16 are chestnut and pacing [tt]





See: http://en.wikipedia.org/wiki/Dihybrid_cr...