In guinea pigs, the color of the fur is determined by a single gene with two alleles control. The brown allele (B) is dominant over the white allele (b). Two heterozygous guinea pigs are crossed. Draw a genetic diagram with the genotypic, phenotypic and ratio information of the P₁ and F ₁ generations of this cross.​

       B          b

B      BB       Bb

b       Bb      bb

Genotype:

ratio - 1:2:1

1 BB = 25%

2 Bb = 50%

1 bb = 25%

Phenotype:

ratio - 3:1

3 Brown: 75%

1 White:25%

HOpe this helps

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not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.