3.4.4 Genetic Diversity and Adaptation Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

What are the steps of variation on a larger scale?

A

There is an initial gene pool
A random mutation occurs- mostly harmful
If it is advantageous, the organism is better adapted and more likely to live and breed
The offspring is also likely to have a new allele
Over time the allele frequency increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How do the conditions an organism lives in affect a mutation?

A

Happens no matter what conditions it lives in

The benefits of a mutation are determined by the environment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a species?

A

A group of organisms that can interbreed to produce fertile offspring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is a population?

A

A group of organisms of the same species living in the same area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is directional selection?

A

When the normal distribution shifts to the left or right due to an environmental charge (selection pressure) or an advantageous mutation occurs
Graph shifts in favour of the advantageous allele

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is stabilising selection?

A

Environmental conditions are stable
Individuals with phenotypes closest to the mean are favoured
These individuals are more likely to breed
It tends to eliminate phenotypes at the extremes
Graph: peak is higher and spread is narrower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How does a mutation affect a protein receptor?

A

Change in DNA nucleotide sequence
Change in amino acid sequence
Alters position of hydrogen/ionic/disulfide bonds
Change in tertiary structure of receptor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly