BIOL 1407 CH.23 Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Natural selection works on individual organisms (differential reproductive success)... | ...but it is the population that evolves. |
Population: | Any group of individuals, usually of a single species, occupying a given area at the same time. Smallest Unit that evolves. |
Species: | A kind of organism, interbreeding and genetically distinct. Given a binomial name (genus and species). Discrete (separate, unique) unit in nature. |
Gene Pool: | Total aggregate of genes (all the alleles) of all individuals in a population at one time |
Hardy Weinberg Theorem: | Describes a non-evolving populations….. 5 conditions for a population to be non-evolving: very large population size, no migration, no net mutations, random mating, no natural selection |
To calculate alleles (p+q=1)... | Where p= frequency of allele A (dominant allele). Where q= frequency of allele a (recessive allele). |
To calculate frequency of genotypes... | ...p^2 + 2pq + q^2 = 1 |
Microevolution: | Small scale evolutionary change, know the 5 causes; genetic drift, gene flow, mutation, nonrandom mating, natural selection. |
Genetic Drift: | Changes in gene pool of a small population. Shifts randomly and by chance. |
2 Kinds of Genetic Drift: | 1. Bottleneck Effect- Catastrophes 2. Founder Effect- A few individuals colonize new habitat. |
Genetic Variation: | (The raw material for natural selection): 2 causes: mutations (occur randomly) and sexual recombination. |
Gene Flow: | Exchange of genes between populations. |
Mutation: | A change in DNA base sequences; causes all heritable "variations." The raw material for natural selection. |
Natural Selection (of Micro-evolution): | Can cause evolution via differential reproductive success. Relative fitness: leaves more viable offspring than others. |
Nonrandom Mating: | Cause evolution by shifting the frequencies of genotypes in a gene pool. |
2 Kinds of Nonrandom Mating: | Inbreeding- Individuals of a population tend to mate with close neighbors. Assortative Mating: Individuals mate with partners that look like each other. |
Created by:
gummybears21
Popular Biology sets