Question

despite having a wide variety of traits, all humans have nearly identical dna. some humans have more traits in common than others. but even closely related individuals, like siblings or a parent and their child, have traits, such as eye color or height, that can differ. differences in traits between members of the same species are sometimes attributable to the environment, but are often due to inherited differences in their dna. specific sections of dna molecules, called genes, contain instructions for making a wide variety of proteins that determine traits and help the body function. even though all humans are 99.9% similar in their genetic makeup, slight differences can result in distinct traits. these differences in dna are called genetic variation. select the true statements. genetic variation is differences in the gene sequences of organisms within the same species. genetic variation can occur between individuals with the same parents. all members of the same species have identical dna. genetic variation can cause visible differences between organisms of the same species.

Explanation:

• The text defines genetic variation as DNA differences within the same species, matching statement A.
• It notes siblings (same parents) have trait differences from genetic variation, supporting statement B.
• The text states humans are 99.9% genetically similar, not identical, so statement C is false.
• It explains slight DNA differences cause distinct visible traits like eye color, confirming statement D is true.

Answer:

A. Genetic variation is differences in the gene sequences of organisms within the same species.
B. Genetic variation can occur between individuals with the same parents.
D. Genetic variation can cause visible differences between organisms of the same species.