Question

The first beef cattle in the United States originated right here in Florida, when the Spaniards imported them in the early 1500s. They were called the Criollo cattle, from which all

American beef cattle are descendant from. In cattle, coat coloration is an inherited trait. What is the genetic basis of coat-color variation in all cattle?

Differences in the environmental conditions of different geographic areas

Differences in the nucleotide sequences of genes

Differences in the diets of individual cattle

Differences in the numbers of chromosomes in cells

Answer 1

The genetic basis of coat-color variation in cattle is differences in the nucleotide sequences of genes. Coat coloration is a heritable trait that is determined by the interaction of multiple genes, each of which has different alleles that can affect the final color and pattern of the coat. These genes can be inherited from both parents and can interact in complex ways to produce a wide range of coat colors and patterns in cattle. Therefore, the correct answer is "Differences in the nucleotide sequences of genes".

Answer 2

B. Differences in the nucleotide sequences of genes are the genetic basis of coat-color variation in all cattle.

Step-by-step explanation:

The variation in coat color is determined by multiple genes, and the interaction between these genes determines the final color of the animal's coat. In cattle, the most important genes controlling coat color are the melanocortin 1 receptor (MC1R) and agouti signaling protein (ASIP). Different alleles (alternate forms of genes) of these genes can result in different coat colors and patterns. For example, the dominant allele of MC1R is responsible for black coat color, while the recessive allele is responsible for red or yellow coat color.