Explain how genetic variation increases chances of survival
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Middle School Life Science › Explain how genetic variation increases chances of survival
Which of these processes is most important for genetic variation?
meiosis
mitosis
asexual reproduction
cellular respiration
Explanation
The answer is meiosis because that is where "crossover" and recombination of DNA take place in sexual reproduction, increasing genetic variation of offspring.
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.
Which genetic process is LEAST likely to add a variety of new traits to an individual?
accurate replication
genetic engineering
deletion of DNA
crossover and recombination
Explanation
The answer is "accurate replication."
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.
A population of ferns is exposed to the same amount of a toxic chemical and only a few of the mushrooms survive. What is the best explanation for the resistance of some of the mushrooms to the chemical's effects?
the presence of mutations in individual mushrooms
developed in response to the chemical being applied
immunity was transferred from the chemical
resistance was passed down from the top of the food chain
Explanation
The answer is "the presence of mutations in individual mushrooms."
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.
Imagine there are 3 populations of snow hares. Snow hares have different colored fur ranging from white to brown. White snow hares can hide from predators more easily in the snow, and light brown snow hares can hide more easily in the grass and brush when the snow melts. Which of these populations of snow hares is most likely to survive this a winter with constantly changing weather and unpredictable snow?
Population 1: All the snow hares are completely white
Population 2: Most of the snow hares are completely white, but some of them have brown splotches.
Population 3: There are many snow hares of all different colors from completely white to completely brown.
population 3
population 2
population 1
not enough information
Explanation
The answer is population 3 because it has the most genetic variation.
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.
One explanation for the variety of species on Earth today is:
Genetic variation allows new species to develop and adapt to ecological niches
Each ecological niche changes in response to the organisms that live within it.
The environment was unchanging in Earth's early history, setting the stage for evolution.
Individuals in a population can change their bodies to meet their needs in an ever changing environment.
Explanation
The answer is "Genetic variation allows new species to develop and adapt to ecological niches."
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.
Why is genetic variation important to a population?
It allows a population to adapt in response to changing environments.
It keeps a population the same despite constantly changing environments.
It helps keep individuals looking different enough to tell each other apart.
The environment doesn't change so there is no need for genetic variation.
Explanation
The answer is "it allows a population to adapt in response to changing environments."
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.
Which situation represents traits that are inheritable?
A puppy sees its mother chase its tail. So it does the same thing.
A random mutation causes the immediate death of an amoeba.
A hamster has a gene which codes for long fur. Its offspring has long fur.
A sea turtle is hit by a motor boat. It survives, but damage is done to the shell.
Explanation
The answer is "a dog has a gene which codes for long fur. Its offspring has long fur."
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.
The LEAST genetic variation would be found in which of the following populations?
microbes that reproduce asexually by budding
birds that reproduce on an island isolated from other habitats
salamanders that occupy many different ecological niches
a population of fungi that just survived a disease
Explanation
The answer is "Microbes that reproduce asexually by budding" because asexual reproduction produces genetic clones.
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.
A novel disease begins to infect individuals in a population. Is the population more likely to survive if it is genetically diverse or if the population has a similar genetic makeup?
genetically diverse
similar genetic make up
genetic diversity will not affect the survival of a population
not enough information
Explanation
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.
According to this diagram, what will increase genetic variation most?
crossing over
no crossing over
DNA replication
cell division
Explanation
The answer is "crossing over" because it will produce 4 genetically different offspring.
A genetically diverse population of individuals is more likely to survive than a population of individuals with similar genetic makeup. Variation allows some individuals within a population to adapt to the changing environment and natural selection allows the expression of those beneficial traits to persist. For example, if a population of organisms has the same genetic makeup, it is far less likely to survive disease, drought, or predation than one with genetic variation.