In horses, black is dependent upon a dominant gene, B, and chestnut upon its rec

Question

In horses, black is dependent upon a dominant gene, B, and chestnut upon its recessive allele, b. The trotting gait is due to a dominant gene, T, pacing gait to its recessive allele, t.
a- If a homozygous black pacer is mated to a homozygous chestnut trotter, what will be the appearance of the F1 generation?
b- zif two F1 individuals were mated, what kinds of offspring would they have and what proportion?
c- If an F1 male were mated to a homozygous female black pacer, what kinds of offspring could they have and in what proportions?

Explanation / Answer

a.)Parental Genotypes: Homozygous Black Pacer = BBtt Homozygous Chestnut Trotter = bbTT The homozygous black pacer offers the following alleles in all of its gametes: Bt The homozygous chestnut trotter offers the following alleles in all of its gametes: bT Therefore all of the offspring from this cross will have the following genotype: BbTt, which means they will all be black trotters.

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