N horses, the hair color gene has a dominant allele B (Black) and a recessive allele b (Chestnut). The gait gene has a dominant allele T (Trotter), and a recessive allele t (Pacer). If a Black Trotter is heterozygous for both traits, how many types of allele combinations for these 2 traits can be found in the gametes it produces

Four (4). BT, Bt, bT and bt

Explanation:

The hair color has two alleles, dominant B for black and recessive b for chestnut.

The gait also has two alleles, dominant T for trotter and recessive t for pacer.

Heterozygous black trotter will have the genotype BbTt.

Gametes usually have half the amount of allele of the parents

BbTt can have the the following allelic combination in its gamete: BT, Bt, bT and bt.

Hence, there are four (4) possible types of allele combinations for the two traits and they are BT, Bt, bT and bt.

You can see the attached image for the Punnet square analysis of the gametic alleles.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.