Download 11-5 Wksht

1. Do macroevolutionary changes occur rapidly? If not, how do these large
phenotypic changes occur?
a. Many small microevolutionary changes that add up
2. Describe one advantage of diversity within a population.
a. Resistant to environmental change
3. Exam Question!: Natural selection can affect humans as evidenced by baby
weight trends. Babies born at lower weights generally lose heat faster and
are more easily infected, resulting in greater mortality. On the other hand, a
baby of large weight is difficult to deliver via normal birth, and is also
selected against. Babies with intermediate birth weights are generally the
most likely to survive. This is a classic example of _______________ selection
where selection favors the ________________.
a. Stabilizing selection, favors intermediate phenotype
4. Balancing vs. stabilizing selection
a. Balancing – selects for heterozygote
b. Stabilizing – selects for intermediate phenotype
5. A human gene causes death at age ~35. Will this gene be selected against?
a. No. Pass on genes by then.
6. Create a story problem for your peers. It should quiz them on a basic
principle such as types of selection, types of speciation, or reproductive
barriers.
7. Do humans have reproductive barriers? Are they pre or post zygotic?
a. Yes, prezygotic