In an experiment, the diencephalon was prevented from developing in a rat. Predict the most likely
consequences of this procedure.
a. The rat was not able to make noises.
b. The rat was unable to move.
c. The rat was unable to detect touch.
d. The rat moved in a circular fashion.
e. The rat could not right itself.
C
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There are cases in which a person inherits a very high susceptibility to cancer. A woman who is heterozygous for a mutation in the BRCA1 gene has one functional allele that helps to suppress tumor formation and one nonfunctional allele of the same gene
She has a 50-70% chance of developing breast cancer before age 70. A tumor is likely to form when a cell "loses heterozygosity" at the BRCA1 gene. This will happen if: A. germ cells in the affected individual develop a mutation in the remaining functional allele of BRCA1. B. a somatic mutation in a breast cell inactivates the remaining functional BRCA1 allele. C. a silent mutation occurs in the remaining functional BRCA1 allele.
Explain what happens when NaCl and other salts build up in soils?
What will be an ideal response?
The advantage of bilateral symmetry is that it allowed for the evolution of
A. cephalization. B. appendages. C. parasites. D. reproductive structures.
The idea that entire populations of species change over time to become better adapted to their environments is called _________.
Fill in the blank(s) with the appropriate word(s).