This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Essay 2 3) It seems that a sexual cycle is maintained because it improves the quality of progeny ( fitness ), despite reducing the overall number of offspring which is two-fold cost of sex. Time loss from doing other activities is another cost of sex. This cycle persist b/c sexual reproduction create diversity which can combat diseases vs. asexuals who make genetic clones of themselves that always persist of the same organism and genes. 4) Narrow sense heritability is t he degree to which a trait is passed from parent to offspring expressed as the ratio of the additive genetic variance to the total phenotypic variance (V A /V P ). Its only valid for the population, environment or time in which they are estimated b/c environment or time can affect the genetic makeup of a population and different population would compose of different genes in the pool. 1) Yes, it is possible to have natural selection operating in a population with no resultant evolutionary change, In case of a population with very little genetic variance, selection even at its highest would be...
View Full Document
This note was uploaded on 07/27/2011 for the course BIOL 3306 taught by Professor Zufall during the Spring '09 term at University of Houston.
- Spring '09