• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
PRE-AP Stage 3 – Learning Plan
PRE-AP Stage 3 – Learning Plan

... DIFFERENTIATION SCAFFOLD: Students will observe the significance of genetic variation as a result of the possible outcomes of various genetic combinations. Students will also examine the different genetic techniques used in studying the genomes of organisms. ACCELERATE: PREP – dominant, recessive, g ...
Managing people in sport organisations: A strategic human resource
Managing people in sport organisations: A strategic human resource

... methylated DNA sequences characteristic of the lyonized chromosome in each cell that is not digested with restriction endonuclease Eag1. DNA in lane 2 contains an FMR1 CGG-repeat number of 90 and is characteristic of a normal transmitting male. The banding pattern observed in lane 3 is representativ ...
NOTE*​ The table/key with the dominant and recessive alleles is on
NOTE*​ The table/key with the dominant and recessive alleles is on

Genetics and Alzheimer’s Disease
Genetics and Alzheimer’s Disease

... Disease characteristics. Alzheimer disease (AD) is characterized by adultonset slowly progressive dementia associated with diffuse cerebral atrophy on neuroimaging studies. It is the most common form of dementia, but less than 5% of families with AD have early-onset familial AD (EOFAD), in which sym ...
L8 Bacterialgenetics 7e
L8 Bacterialgenetics 7e

... Chapter 8: Bacterial Genetics ...
Student Handout
Student Handout

... Heredity is the passing of physical characteristics, or traits, from parents to offspring. Traits, such as stem height or hair color, vary between individuals and are determined by genetic material inherited from each parent. Scientists use the term "gene" for the unit of genetic material that contr ...
discuss-the-relative-roles-of-selection-and-drift-in
discuss-the-relative-roles-of-selection-and-drift-in

... females show gametic isolation but this is not the same for those living in allopatry. To support this observation he carried out an experiment in the laboratory. He evolved populations of both species either separately or together. Prezygotic isolation only occurred in those kept together. This is ...
SyntheticTheoryofEvo..
SyntheticTheoryofEvo..

... the next generation. As a result, the frequency of this recessive allele was progressively reduced. This has all changed, however, since the discovery of insulin in 1921. Diabetes is no longer the killer of children it once was, and diabetic children grow up to have children with a higher than avera ...
Mendel: Not a clue about chromosomes!
Mendel: Not a clue about chromosomes!

... • The multiplication rule states that the probability that two or more independent events will occur together is the product of their individual probabilities • Probability in an F1 monohybrid cross can be determined using the multiplication rule • Segregation in a heterozygous plant is like flippin ...
HW simulation
HW simulation

... Evolution. Hardy-Weinberg Lab Adapted from: Miller, K., Levine, J. (2004). Biology. Boston, MA: Pearson Prentice Hall. Background: Microevolution is the study of the change in the frequency of an allele in a population from one generation to the next. Mathematicians Hardy and Weinberg explained how ...
Exploring genetic variation
Exploring genetic variation

FREE Sample Here
FREE Sample Here

... to have a genetic basis and prepare a brief research report on it. With what other factors is the disease connected? How does modern medicine approach its treatment? Creationism: What are the basic claims of creationists? Why do they feel that creationism can be called “scientific” and why do most s ...
II. The Discovery of Evolution
II. The Discovery of Evolution

... to have a genetic basis and prepare a brief research report on it. With what other factors is the disease connected? How does modern medicine approach its treatment? Creationism: What are the basic claims of creationists? Why do they feel that creationism can be called “scientific” and why do most s ...
Notes - J Co Review
Notes - J Co Review

... If we want to predict whether or not their offspring will be colorblind, we put the sex chromosomes into a Punnett square and solve it ...
Recombination and Linkage
Recombination and Linkage

... – Complete genotype data: marker allele freq don’t matter – Incomplete data on the founders: misspecified marker allele frequencies can really screw things up – BAD: using equally likely allele frequencies – BETTER: estimate the allele frequencies with the available data (perhaps even ignoring the r ...
LAB 5: Breeding Bunnies - Ms Kim`s Biology Class
LAB 5: Breeding Bunnies - Ms Kim`s Biology Class

... populations. Sometimes there is a slight advantage to being heterozygous for a trait rather than homozygous dominant. So the situation is now more complicated: homozygous recessives are still strongly selected against and do not survive to reproduce, but now, in addition, homozygous dominants have a ...
Word doc
Word doc

Chapter 11 Observable Patterns of Inheritance
Chapter 11 Observable Patterns of Inheritance

... Mendel crossed F1 plants with homozygous recessive individuals • A 1:1 ratio of recessive and dominant ...
AP Biology Study Guide
AP Biology Study Guide

Chapter 2 - Test Bank 1
Chapter 2 - Test Bank 1

SC.912.L.15.12 - List the conditions for Hardy
SC.912.L.15.12 - List the conditions for Hardy

... This video describes the Hardy-Weinberg Principle. It is fairly entertaining mostly due to the narration of the instructor. ...
Evolution by Natural Selection Evolution by Natural Selection
Evolution by Natural Selection Evolution by Natural Selection

AP Biology: Chapter 13 - 15
AP Biology: Chapter 13 - 15

... 10. In seals, the gene for whisker length has two alleles. The dominant allele (W) codes for long whiskers & the recessive allele (w) codes for short whiskers. What percentage of offspring would be expected to have short whiskers from the cross of two long-whiskered seals, one that is homozygous dom ...
Punnett Squares
Punnett Squares

Document
Document

... Blood type quick facts • Red blood cells are called erythrocytes • Proteins on their surfaces are called antigens, controlled by genes • Antigens make antibodies to foreign substances, which includes RBCs with different antigens on their surface • 4 phenotypes: A, B, AB, O • 3 alleles: IA, IB, i ...
< 1 ... 304 305 306 307 308 309 310 311 312 ... 511 >

Genetic drift



Genetic drift (or allelic drift) is the change in the frequency of a gene variant (allele) in a population due to random sampling of organisms.The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces. A population's allele frequency is the fraction of the copies of one gene that share a particular form. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation.When there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies the effect is smaller. In the early twentieth century vigorous debates occurred over the relative importance of natural selection versus neutral processes, including genetic drift. Ronald Fisher, who explained natural selection using Mendelian genetics, held the view that genetic drift plays at the most a minor role in evolution, and this remained the dominant view for several decades. In 1968, Motoo Kimura rekindled the debate with his neutral theory of molecular evolution, which claims that most instances where a genetic change spreads across a population (although not necessarily changes in phenotypes) are caused by genetic drift. There is currently a scientific debate about how much of evolution has been caused by natural selection, and how much by genetic drift.
  • studyres.com © 2026
  • DMCA
  • Privacy
  • Terms
  • Report