Human Variation Already Verified A+
1. A source of human genetic variation is **mutation**.
2. Three of the following are valid reasons to study human genotypic variation. Which one is not? **To
discover ways to eradicate populations with poor fitness**.
3. **True**: A mutation that impacts...
1. A source of human genetic variation is **mutation**.
2. Three of the following are valid reasons to study human genotypic variation. Which one is not? **To
discover ways to eradicate populations with poor fitness**.
3. **True**: A mutation that impacts individuals during their reproductive years but appears to be fixed
in the population likely has not been present for very long.
4. **True**: Aside from Neanderthals, no human group has been isolated from all others for more than
6,000 years, which is not long enough to evolve into a subspecies or separate species.
5. To understand the relationships among populations, we would need to examine the variation in DNA
that results from **gene flow**.
6. Many Norwegians are very fair, with no known selective advantage for traits like blonde hair and blue
eyes. This is likely an example of the **founder's effect**.
7. A population that exhibits greater variation than others has had more time to accumulate mutations
and therefore is **an older population**.
8. The function of immune globulins (immunoglobulins) is to **recognize foreign proteins**.
9. **False**: The final stage of the demographic transition in Europe was not characterized by a lower
and unstable population size.
10. **False**: Pheromones are body-produced scents that we are generally not consciously aware of.
11. The epicanthic fold, a fold of skin over the inner eye, is common in many infants regardless of their
ancestry, but it eventually disappears in **all of the above**.
, 12. Skin color provides **no reliable information** about a person's characteristics.
13. Historical, linguistic, and genetic research indicates that the pigmentation of Scandinavians is a result
of **genetic drift**.
14. There must be a minimum of **two** different alleles at one locus to determine if a person has type
A, B, or O blood.
16. Sickle cell anemia increases human fitness in regions where malaria is prevalent by **altering red
blood cells from a disc shape to a sickle shape**.
17. The type of DNA that is not subject to natural selection and does not undergo recombination is
**mitochondrial DNA**.
18. Genotypic variation (the diversity and frequency of alleles) is enhanced by **mutation and gene
flow**.
19. Homeostasis refers to an organism's ability to maintain **a stable internal environment in the face
of diverse and disruptive external environmental changes**.
20. **True**: The rapid fixation of alleles for hemoglobinopathies like sickle cell anemia in a population
suggests that malaria exerted a strong selective force.
21. **True**: For most of human history, populations have been relatively low compared to those of
other animal species.
22. **True**: Theoretically, if a stem cell could be transformed into a heart muscle cell, it could be used
to repair heart muscle damaged by a heart attack.
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