I believe it must a. Overcome the effects of friction
The earth surface and when the sun and earth move. Plus the north and South hemisphere
Answer:
Phenotype: 2:2 or 1:1 / Genotype: 2:2 or 1:1 / 50% probability for chestnut color
Explanation:
If we put the two horses' genotypes in a Punnett square:
<u> B b</u>
<u>b</u> Bb bb
<u>b</u> Bb bb
The phenotype is describing the ending color of the offspring, where 2 of the 4 will be brown (Bb) and 2 of the 4 will be chestnut (bb), resulting in a 2:2 ratio. Genotype only refers to the alleles, where 2 of the 4 will be hybrid (Bb) and 2 of the 4 will be homozygous recessive (bb), again resulting in a 2:2 ratio. There is only a 50% chance that the offspring's phenotype will be chestnut color (bb) because the chestnut allele is recessive.