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Bio SG3P1

Bio S3 P1

QuestionAnswer
gene pool the combination of all the genes present in a reproducing population
microevolution evolution that occurs on a small scale, only affecting a SINGLE population
macroevolution evolution that occurs on a LARGE SCALE that affects the changes in species across populations
convergent evolution distantly related organisms independently evolve similar traits to adapt to similar necessities (ANALOGOUS)
divergent evolution organisms within a species evolve different traits (supports common ancestry) (HOMOLOGOUS)
1. explain the principles of natural selection. write a real-world example of evolution and how each principle was met. - overproduction of offspring - variation - adaptation - descent with modification There are red bugs & green bugs. Birds prefer taste of red bugs, so lots of green bugs less red bugs
2. Explain how diversity within a species has resulted in an increase in fitness More diversity causes natural selection which allows organisms to have the best traits. The organisms with these traits will survive and reproduce better.
3. Explain what is meant by the phrase, "Individuals don't evolve, populations do" evolutionary change occurs at the level of populations over time, rather than within an individual organism's lifetime.
4. Sketch pictures and explain the difference between the three modes of selection do the graphs
5. Define allele frequency number of times the allele appears in a population
6. What does p and q stand for? p = frequency of dominant allele q = frequency of recessive allele
7. What is a genotype frequency? the number of individuals with a given genotype divided by the total number of individuals in the population.
8. What does "relative frequency" of an allele mean? the number of times the allele occurs in a gene pool divided by the total number of alleles for the same gene.
9. Give 2 examples of Natural selection in humans. sickle cell disease (resistance to malaria), & lactase persistence (ability to drink milk)
Created by: jewlsasterr
 

 



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