Question

What causes the differences in physical characteristics like hair color among people?

different versions of genes
variations in DNA length
different numbers of chromosomes
variations in cell nucleus size

Answer 1

Answer:

different versions of genes

Answer 2

Answer: hey! hope it helps

Explanation: In genetics, the physical characteristics are referred as phenotype. Each character such as hair color in offspring is determined by a pair of genes. One gene is inherited from father and other gene is inherited from mother. The phenotype is determined by the dominant gene. The recessive gene of a pair does not show its effect in heterogeneous condition. Therefore, the offspring inherits a dominant gene and a recessive gene then the dominant gene will show the character. This is called Mendel’s law of dominance