In horses, black is dominant to chestnut and trotting is dominant to pacing. A heterozygous black and h o m o zygous pacer is crossed with chestnut and heterozygous trotting. What is the number of black pacers in a population of 260,000

65,000

Explanation:

Black (B) is dominant to chestnut (b)

Trotting (T) is dominant to pacing (t)

A heterozygous black and h0m0zygous pacer (Bbtt) is crossed with a chestnut and heterozygous trotting (bbTt)

                           Bbtt x bbTt is the cross.

Potential alleles - Bt and bt      bT and bt

Punnett square attached

Possible genotypes are: BbTt, bbTt , Bbtt, bbtt

Black pacers have the genotype BBtt or Bbtt

1:4 of the offspring have The Bbtt genotype.

If there are 260,000 in the population, then 260,000 / 4 would be black pacers.

260,000/4 = 65,000

the answer to the blank provided is “an autosomal gene that is required for the expression of genes on the x chromosome”.

testis-determining factor, abbreviated as td, which is more popularly known as sex-determining region y or sry protein, is a dna-binding protein or  gene-regulatory protein/transcription factor, encoded by the  sry gene. it is the gene responsible for the initiation of male gender determination in humans.