QuestenaPractice that shows what to review next
SearchCreate a test
Question 101

A single mutation appears in the DNA of an organism. What is the most likely effect on its phenotype?

  1. Little or no effect on the organism at allCorrect answer
  2. A visible change to at least one characteristic
  3. A change that always harms the organism
  4. A change that appears only in its grandchildren

Explanation

Even inside a gene, many single-base changes still leave the protein doing its job, so most such changes pass unnoticed. Expecting a visible difference every time would mean each individual looked obviously unlike its parents, which is not what is observed.

Continue with this test

Start practice
Understand this topic (≈6 min)Back to test
Question 101: A single mutation appears in the DNA of an organism. What… · Genetics Basics · Questena