Contrast Mendel's model of heredity with the blending model. Which one is a better description of the way traits are passed from one generation to the next?
What will be an ideal response?
Responses should identify Mendel's model as the particulate model with discrete units as opposed to a fluid model that permanently diluted the traits. Of course Mendel's model is more realistic as genes are physical entities responsible for heredity.
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Which of the following could be a density-independent factor limiting human population growth?
A) social pressure for birth control B) earthquakes C) plagues D) famines
You find a mutant Drosophila larva that is lacking anterior structures. You know that this embryo had normal amounts of Bicoid protein. What other type of mutation could cause this result?
A. A hunchback mutation that inhibits Hunchback production. B. A hunchback mutation that causes Hunchback overproduction. C. A maternal effect gene mutation that inhibits the production of a maternal gene product. D. A segmentation gene mutation that inhibits production of a segmentation gene product. E. A segmentation gene mutation that causes the overproduction of a segmentation gene product.
During human development, the maternal and fetal blood circulation do not become separate until the second trimester
1.True 2.False
If a water molecule passes through the outer membrane of a chloroplast, how many more membranes will it have to move through to be in the stroma?
A. 1 B. 2 C. 3 D. 4