Discuss how crossing-over leads to greater variability of phenotypes. Give an example to help explain your answer.

Crossing over leads to greater variability of phenotypes because it is creating new patterns, which ultimately leads to a different DNA sequence. Crossing over is when two homologous chromosomes swap a little bit of their DNA. Crossing over is what creates genetic variability.

An example would be if all zebras in a population were exactly the same. No crossing-over means no genetic variability. A second zebra population has a lot of genetic variabilities because of a lot of their chromosomes crossed-over. Now pretend a diesase struck both populations. the population with genetic diversity will probably survive more than the population with diversity. This is because some of the zebras may have built an immunity to it when their chromosomes crossed-over. The population with no diversity will definitely die out if they didn't already have the immunity against the diesease built up.

Explanation:

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i think the answer is b.