Cross a heterozygous individual with a homozygous recessive one determine the genotype ratio and phenotype ratio of their offspring

Let's have our alleles be J = dominant, j = recessive. And for fun let's make the dominant phenotype black coat, the recessive brown coat.

Heterozygous x homozygous recessive

   = Jj x jj

Punnett square:

       J        j

j      Jj        jj

j      Jj        jj

Genotypic ratio: 2 Jj : 2 jj, or a one-to-one ratio of Jj to jj.

Phenotypic ratio: 2 black : 2 brown, or a one-to-one ratio of black to brown.

what's the question ?

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.