Question

The graph below shows the light absorbance of two kinds of chlorophyll.

mc007-1.jpg

Which color of light does chlorophyll b absorb more of than any other color?
red
yellow
green
blue

Unattached earlobes is a dominant trait, E. A parent who is homozygous for unattached earlobes is crossed with a parent who is homozygous for attached earlobes. Which describes the genotypes of their offspring?
100 percent Ee
100 percent unattached earlobes
100 percent ee
100 percent attached earlobes

Two animals that can be found at the Grand Canyon include the Abert’s and Kaibab squirrels. The Abert’s squirrel is found at the south rim of the canyon and in a few surrounding states. The Kaibab squirrel, however, can only be found at the canyon’s north rim, mainly on the Kaibab Plateau. The Kaibab squirrel is not found anywhere else in the world. Scientists believe that the squirrels are actually closely related and have developed separately as a result of geographic isolation. It is possible that the squirrels were separated by plateau erosion that separated the forests and isolated the Kaibab population. Some scientists are studying if the squirrels are now two separate species or if the Kaibab squirrel is simply a subspecies of the Abert’s squirrel. Separate species are unable to reproduce with each other. Which evidence would be used to support the claim that the squirrels are two separate species?
The Abert’s squirrel is found at the south rim of the canyon, but the Kaibab squirrel is found at the north rim of the canyon.
Geologists prove that plateau erosion is the main cause of forest separation in the region.
Scientists observe that Abert’s squirrels are slightly larger and have bushier tails than Kaibab squirrels do.
When placed together in pairs for study, no pair of Abert’s squirrel and Kaibab squirrel result in offspring.

Some theories are developed from repeated testing of a single hypothesis. Cell theory, germ theory, and the theory of evolution all have developed from the testing of multiple related hypotheses. Which statement best explains why some theories develop this way?
A hypothesis tests many variables at once, which can lead to new hypotheses.
Multiple related hypotheses will become theories before a single hypothesis does.
Each scientist has used different wording when developing his or her hypothesis.
Each experiment reveals a different piece of information that is needed to develop the theory.

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. A pansy that is homozygous for purple flowers (PP) is crossed with a pansy that is homozygous for pink flowers (pp).

A pansy with purple flowers. A pansy with pink flowers.

Which genotypes will be included for the offspring in the Punnett square for this cross?
PP, Pp, and pp
PP and pp
PP and Pp
Pp only

Answer 1

1) Blue — chlorophyll b absorbs blue light most strongly.

2) 100 percent Ee — EE × ee produces all heterozygous (Ee) offspring (unattached earlobes).

3) When placed together in pairs for study, no pair of Abert’s squirrel and Kaibab squirrel result in offspring — reproductive isolation supports separate species.

4) Each experiment reveals a different piece of information that is needed to develop the theory.

5) Pp only — PP × pp produces all heterozygous (Pp) offspring.