Billy and Johnny are brothers, but they do not look alike. Which of the following factors contributed to this genetic variation? cylokinesis and cloning DNA replication and mitosis asexual reproduction and binary fission because assortment

## Step 1<br />The question is asking about the factors that contribute to genetic variation among individuals, specifically in the case of two brothers, Billy and Johnny. Genetic variation is the differences in the genetic material among individuals or populations. <br /><br />## Step 2<br />The options provided are:<br />- Cylokinesis and cloning<br />- DNA replication and mitosis<br />- Asexual reproduction and binary fission<br />- Independent assortment<br /><br />## Step 3<br />Cylokinesis and cloning, DNA replication and mitosis, and asexual reproduction and binary fission are all processes that are involved in cell division and reproduction. However, they do not contribute to genetic variation.<br /><br />## Step 4<br />Independent assortment, on the other hand, is a process that contributes to genetic variation. Independent assortment is a mechanism of evolution that occurs during meiosis. During meiosis, chromosomes are randomly assorted into sex cells. This means that each sex cell contains a random mix of chromosomes from the parent cell. This random assortment of chromosomes leads to genetic variation among offspring.