Most organisms display a circadian rhythm, a cycling of ...

Question

Most organisms display a circadian rhythm, a cycling of biological processes that is roughly synchronized with day length (e.g., jet lag occurs in humans when rapid movement between time zones causes established circadian rhythms to be out of synch with daylight hours). In Drosophila, pupae eclose (emerge as adults after metamorphosis) at dawn.

Using this knowledge, how would you screen for Drosophila mutants that have an impaired circadian rhythm?

Accepted Answer

Hey, everyone. Let's take a look at this question together. All of the following types of mutations are due to errors in DNA replication, except which is it answer choice. A missense mutation, answer choice B nonsense mutation, answer choice C frameshift mutation or answer choice D and deploy mutation. Let's work this problem out together to try to figure out which of the following types of mutations are not due to errors in DNA replication. So we can recall that a missense mutation, a nonsense mutation and a frameshift mutation are all mutations that are caused by alterations in the DNA sequence. And we note that alterations that are made in the DNA sequence are mutations that are due to errors in DNA replication. So a missense mutation, a nonsense mutation and a frameshift mutation are all due to errors in DNA replication. So answer choice D is the correct answer by process of elimination. And in a employing mutation is a mutation that results in having an abnormal amount of chromosomes, which this abnormal amount of chromosomes is caused by errors that occur during mitosis or meiosis such as nondisjunction and are not due to errors in DNA replication. So answer choice D is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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