StudyXY
RegisterLog in
Back to AI Flashcard MakerBiology /Biology- Genetic Drift

Biology- Genetic Drift

Biology8 CardsCreated 4 months ago

This deck covers key concepts related to genetic drift, including its effects on populations, the founder effect, bottleneck effect, and allele frequencies.

PrintEmbedImportReport

Genetic drift

Any random change to the allele frequency of a population due to a chance event

Tap or swipe ↕ to flip
Swipe ←→Navigate
1/8

Key Terms

Term
Definition

Genetic drift

Any random change to the allele frequency of a population due to a chance event

Genetic drift impact on different sized populations

Greater impact upon a smaller population, rather than a large population. When a large populations mating patterns remain random, the allele freque...

Founder effect

When a small population (a small group of individuals) colonises a new isolated area, such as an island and the range and the frequency of alleles ...

Founder effect effects on population sizes

Due to a small population, there is a greater chance for genetic drift to occur and there to be a lower range and frequency of alleles. As a result...

Bottleneck effect

Occurs when a population suddenly reduces in size due to an extreme event (human or enviromental) that doesn't pick favourable alleles

Bottleneck effect on population size

When there is a rapid decline in the population size, it is likely that the range of alleles will be reduced and the frequency of alleles will chan...

Log in to view all terms

Related Flashcard Decks

Biology

A-LEVEL PE (OCR): PAPER 3 - Ethics and Deviance in Sport

These flashcards describe key performance-enhancing methods, including blood doping—a technique used to increase red blood cell count and oxygen-carrying capacity, commonly by endurance athletes—and anabolic steroids, which boost strength, aggression, and training capacity. They highlight how these methods aim to enhance performance, often through artificial physiological manipulation.

21 cards
View Deck
Biology

A-LEVEL PE (OCR): PAPER 1 - Energy for Exercise

These flashcards cover fundamental concepts of cellular energy, including ATP as the primary energy source for muscular contraction, the role of the enzyme ATPase in ATP breakdown, and the definition of exothermic reactions that release energy. They provide a concise overview of how energy is produced and utilized in biological systems.

47 cards
View Deck
Biology

3MB Psychiatry: Neurobiology of Mood

This flashcard set explains the brain’s appetitive (approach) and aversive (defensive) mood systems, describing how they drive behaviour toward reward or avoidance of threat, and identifies the key neurotransmitters associated with each—dopamine for approach and serotonin for avoidance.

8 cards
View Deck
Biology

Psychology - Chapter 3 Biological Psychology Part 3

This deck covers key concepts from Chapter 3 of Biological Psychology, focusing on brain structures and their functions, including the occipital lobe, limbic system, brain stem, and nervous systems.

23 cards
View Deck
Biology

Psychology - Chapter 3 Biological Psychology Part 2

This flashcard deck covers key concepts from Chapter 3 of Biological Psychology, focusing on neurotransmitters, brain structures, and their functions.

25 cards
View Deck
Biology

Animal Behaviour - Applied Cat Ethology

In applied cat ethology, behavioural genetics are primarily inherited through the paternal line. This means certain behavioural traits, such as temperament or sociability, can be strongly influenced by the genetics of the sire (father).

56 cards
View Deck

Study Tips

  • Press F to enter focus mode for distraction-free studying
  • Review cards regularly to improve retention
  • Try to recall the answer before flipping the card
  • Share this deck with friends to study together
Biology- Genetic Drift
TermDefinition

Genetic drift

Any random change to the allele frequency of a population due to a chance event

Genetic drift impact on different sized populations

Greater impact upon a smaller population, rather than a large population. When a large populations mating patterns remain random, the allele frequency remains constant. But when a population is small or becoming smaller, allele frequencies will change between generations by chance so begin to drift into an increase or decrease

Founder effect

When a small population (a small group of individuals) colonises a new isolated area, such as an island and the range and the frequency of alleles that are present within this small group is unlikely to be representative of the original population that the founder population came from.

Founder effect effects on population sizes

Due to a small population, there is a greater chance for genetic drift to occur and there to be a lower range and frequency of alleles. As a result, evolution is likely to occur faster in founder populations when compared to the original population. Therefore some alleles will be less frequent or more frequent than in the original population

Bottleneck effect

Occurs when a population suddenly reduces in size due to an extreme event (human or enviromental) that doesn't pick favourable alleles

Bottleneck effect on population size

When there is a rapid decline in the population size, it is likely that the range of alleles will be reduced and the frequency of alleles will change. If the population increases again it will have reduced genetic biodiversity.

Allele frequencies

The percentage of different alleles that exist in a population for a given gene. Allele frequencies don't always match up with phenotype frequencies, as the phenotypes of recessive alleles won't be expressed in heterozygous individuals.

Migration effects on population

The changes in allele frequency will be greater in smaller populations, because an individual's alleles represent a greater percentage of the alleles of the population.