In 2017, Holen and colleagues announced the discovery of a 130,000-year-old site in California that they claimed contained a mastodon that had been butchered by humans (genus Homo). Why did some in the scientific community express skepticism and caution in accepting the findings?
A. Humans are not thought to have mastered sophisticated tool use by 130,000 years ago.
B. Mastodons are thought to have gone extinct long before that.
C. The level of cooperative hunting needed to take down a mastodon did not appear until much more recently.
D. It is widely believed that Homo sapiens are the only humans to have occupied North America and they did not arrive until 20,000 years ago.
E. Homo neanderthalensis, the dominant hominin of the time, was vegetarian.
Answer: D. It is widely believed that Homo sapiens are the only humans to have occupied North America and they did not arrive until 20,000 years ago.
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To create a DNA profile from scarce quantities of DNA, such as a fossil or a single hair, the ____________________ technique is necessary to obtain enough DNA for analysis
Fill in the blank(s) with correct word
Answer the following statements true (T) or false (F)
1. Homologous chromosomes are identical copies of each other. 2. Mitotic cell division is never used by organisms as a means of reproduction. 3. A diploid queen honeybee produce eggs by meiosis. Some of these eggs are never fertilized, while the rest are. These unfertilized eggs develop into haploid male honeybee. This can be an example of sexual reproduction. 4. For any given species, cells in metaphase II of meiosis would contain 2? more genetic material than cells in metaphase of mitosis. 5. The karyotype of a normal human male would show a total of 23 pairs of homologous chromosomes.
In the figure above, which DNA fragment is closest to the positive electrode?
a. A b. B c. E d. G e. H
The rate of increase for a population (r) refers to what kind of relationship between birth rate and death rate?
a. their sum b. their product c. the doubling time between them d. the difference between them e. reduction in each of them