Answer :
The first one ..... 0 BB: 2 Bb: 2 bb use punnett squares it helps, just search how to use them.
The expected genotypic ratios are 0BB: 2Bb : 2bb. The 1st option is correct.
The Mendelian theory by George Mendel explains the monohybrid experiment crossing which can be achieved by the use of punnet square.
From the given information, in cocker spaniels
- The allele for black coat color = B
- The allele for brown coat color = b
If a brown cocker spaniel i.e bb (recessive trait) is crossed with a heterozygous black cocker spaniel i.e. Bb
Then, we can use the punnet square to determine their genotypes.
b b
B Bb Bb
b bb bb
Therefore, we can conclude that the genotypic ratios are 0BB: 2Bb : 2bb
Learn more about monohybrid crossing here:
https://brainly.com/question/24076691?referrer=searchResults