Post on 17-Dec-2015
transcript
_______________________“Lamarck”
•It is now well established that acquired traits do not influence the DNA of gametes and therefore, cannot be passed on to offspring
_________________________
• The differential reproduction of genotypes caused by human intervention
• (e.g., breeding dogs).
__________________“survival of the fittest”
•Individuals cannot adapt to their environment; they are adapted or are not; adapted individuals will survive and produce more offspring•Requires genetic variation•Organisms in the same population vary among themselves•Variation is heritable: offspring tend to resemble their parents•Some of the variations we see increase an organism’s chances of survival and reproducing. Others don’t. •Conclusion: Some variations become more common, and others more rare, over time.
_____________________•A type of natural selection in which certain characteristics are actively sought out by one sex, usually the female•One result is sexual dimorphism (a marked difference between males and females)•Those traits that become more common are those that help an individual reproduce (not necessarily survive)
_______________________“Lamarck”
•It is now well established that acquired traits do not influence the DNA of gametes and therefore, cannot be passed on to offspring
_________________________
• The differential reproduction of genotypes caused by human intervention
• (e.g., breeding dogs).
__________________“survival of the fittest”
•Individuals cannot adapt to their environment; they are adapted or are not; adapted individuals will survive and produce more offspring•Requires genetic variation•Organisms in the same population vary among themselves•Variation is heritable: offspring tend to resemble their parents•Some of the variations we see increase an organism’s chances of survival and reproducing. Others don’t. •Conclusion: Some variations become more common, and others more rare, over time.
_____________________•A type of natural selection in which certain characteristics are actively sought out by one sex, usually the female•One result is sexual dimorphism (a marked difference between males and females)•Those traits that become more common are those that help an individual reproduce (not necessarily survive)