What is the ultimate source of all new genetic variation?

Question

BlackTom AI · Accepted Answer

When considering where new genetic variation originates, we look at the mechanisms that introduce novel alleles and sequences into a population.
Option 1: Mutation. Mutations are changes to DNA that can create new alleles, insert novel genetic material, or alter gene function. They are the primary source of new genetic variation upon which evolution acts, providing the raw material for selection, drift, and adaptation.
Option 2: Genetic drift. Genetic drift describes random fluctuations in allele frequencies over time, especially in small populations. It does not create new variation; instead, it changes how existing variation is distributed within the population.
Option 3: Speciation. Speciation is the process by which new species arise, often involving divergence and reproductive isolation. While it is a critical outcome in evolution, it does not generate new genetic variation itself; it organizes or partitions variation that already exists.
Option 4: Mitosis. Mitosis is the cell division process that produces identical daughter cells for growth and tissue maintenance. It preserves genetic information rather than creating new variation, so it is not a source of novel genetic diversity.
In summary, the unique role of mutation is to introduce new genetic variants that existing mechanisms like drift, speciation, or mitosis cannot originate on their own, making it the ultimate source of new genetic variation.

What is the ultimate source of all new genetic variation?单项选择题

类似问题

What was the world's first widely adopted biodiversity policy?

The aim of the Paris Agreement is to ensure that the earth’s preindustrial temperature is not exceeded by more than º Celsius.

The IPCC's mission is to Blank ______.

Why have most international agreements for environmental protection been based on the honor system?

As was exhibited with the Montreal Protocol and the encouragement of reduced CFC production, trade can be an effective tool to compel compliance with international treaties.

The Stockholm Declaration and UNEP were the result of the Blank ______ first conference on the Human Environment in 1972.

In addition to the direct mission of the Convention on International Trade in Endangered Species (CITES), why was CITES so important?

President Trump hiring a corporate leader from the oil and gas industry to head the Department of Energy is an example of regulatory ; one intention behind this was to change environmental policy.

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单