genes

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Across
  1. 3. / a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring
  2. 4. selection / also called diversifying selection, describes changes in population genetics in which extreme values for a trait are favored over intermediate values. In this case, the variance of the trait increases and the population is divided into two distinct groups
  3. 5. / when something has a evolved Thoth
  4. 6. selection / is a type of natural selection in which genetic diversity decreases and the population mean stabilizes on a particular trait value
  5. 7. structure / structures that have different mature forms in different organisms but develop
  6. 10. selection / selection by humans for breeding of useful traits from the natural variation among different organisms
  7. 13. organ / organ that are despairing
  8. 14. selection / the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution
  9. 15. for existence / competition among members of a species for food living space and the other necessities of life
  10. 16. descent / principle that all living things have a common ancestor
  11. 17. / change in a kind of organism over time process by which modern organisms have descended from ancient organisms
Down
  1. 1. with modification / when something evolved
  2. 2. of the fittest / process by which individuals that are better suited to
  3. 4. selection / In population genetics, directional selection is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype
  4. 8. / preserved remains or evidence of an ancient organism
  5. 9. drift / what do you do in a genetic car (just making sure you where paying attention) variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce
  6. 11. / inherited characteristic that increases an organism’s chance of survival
  7. 12. / ability of an organism to survive and reproduce in its environment