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Human Variation Final Already Graded A+ Statements and Responses - What does skin color tell you about a person? ️Nothing. - Skin color evolved as a response to ____________. ️Ultraviolet radiation in a given environment. - A source of human genetic variation is ____________. ️Mutation. - G...

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Genetic Research in Human Populations / Human Genetics / Human Variation Complete Papers Rated A+ For Guaranteed Success

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Human Variation Final Already Graded A+
Statements and Responses

- What does skin color tell you about a person? ✔️Nothing.

- Skin color evolved as a response to ____________. ✔️Ultraviolet radiation in a given environment.

- A source of human genetic variation is ____________. ✔️Mutation.

- Genotypic variation (the variety and frequency of alleles) is increased by ___________. ✔️Gene flow
and mutation.

- T/F: Since our environment is always changing, we might imagine that changes in the human genotype
will occur in the future. ✔️True.

- A gradual change in allele frequency or the strength of phenotypic trait expression (e.g., features like
the epicanthic eye fold or skin tone) over geographic distance is known as ____________. ✔️Clinal
variation.

- The epicanthic fold is a small fold of skin over the inner corner of the eye. Many infants have this,
regardless of their ancestry, but it disappears in ______ as they grow.

a. Africans

b. Europeans

c. Western and South Asians

d. All of the above

✔️d. All of the above.

- T/F: Europeans probably exhibit more genetic variation than other populations because they were
originally part of a larger group and are considered the oldest population on Earth (the "parent"
population), having had time to gather more genetic variants. ✔️False.

, - History, language, and genetic studies suggest that the pigmentation of Scandinavians results from
____________. ✔️Genetic drift.

- T/F: Except for Neanderthals, no human group has ever been isolated from all others for more than
6,000 years, which is not enough time to evolve into a subspecies or separate species. ✔️True.

- The human population reached 7 billion in the year ____________. ✔️2011.

- T/F: The last stage of the demographic transition in Europe was characterized by a lower and unstable
population size. ✔️False.

- The fertility rate in the United States has reached ___________. ✔️Replacement level.

- T/F: For most of human history, human populations have been relatively low compared to other animal
species. ✔️True.

- In general, what has the most effect on post-natal growth and development? ✔️The environment.

- Before the advent of bottle feeding, most children were breastfed until age ______, although the
nutrition obtained from nursing decreases rapidly during this period and most children must start
receiving some form of supplemental diet by ______ months of age, a process known as weaning. ✔️3
years, 6 months.

- What function does the hypothalamus serve? ✔️It secretes various hormones that prompt the
pituitary gland to release other hormones.

- Human children are born in a helpless state and therefore ____________. ✔️Require greater parental
investment than any other mammal in the animal kingdom.

- T/F: Human growth and development represent a subfield of Human Biology because it addresses
variation and adaptation. ✔️True.

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