In manx cats, the allele “tt” yield a cat with a normal long tail, the alleles “tt”
yield a cat with a short or absent tail, and the alleles “tt” are lethal to the embryo.
predict the genotypes and phenotypes of potential kittens resulting from the
mating of two short tailed cats.

Genotype of offsprings: 1 TT, 2Tt, 1tt (lethal)

Phenotype of offsprings: 1 long tail, 2 Short/absent tail

Explanation:

This is a cross involving a single gene coding for tail length in cat. According to the question, the gene exhibits incomplete dominance because one allele is incompletely dominant over the other, and instead produce a third intermediate phenotype. T allele codes for normal long tail, while allele t is lethal, but a short or absent tail is produced in a heterozygous state (Tt).

In a cross between two short-tailed cats i.e. Tt, gametes with T and t alleles will be produced and when combined using a punnet square, four possible offsprings will result having the following genotypes:

TT, Tt, Tt, tt (1:2:1)

The TT offspring will be phenotypically long-tailed, the two Tt offsprings will be phenotypically short-tailed while the tt offspring will not survive since the expression of the homozygous 't' allele is lethal to the developing embryo. Hence, the Phenotypes of the offsprings will likely be 1 long-tailed, 2 Short or absent tailed.

equal distribution i think.