In your garden, you have an Ailanthus altissima, also known as the Tree-of-Heaven. You try adding additional plants to the same garden bed, but notice poor seed germination and seedling growth around the tree. What is the most likely explanation for this?
A. The tree is utilizing most of the available miconutrients in the soil.
B. The tree is blocking most of the available sunlight which is limiting germination and growth.
C. The tree is releasing chemicals into the soil that are inhibiting germination and growth of other plants.
D. The tree has a mutalistic relationship with animals that are removing plants that are in competition for resources with the tree.
E. The roots of the tree have a stronger water potential than the seedlings which is causing the seedlings to dehydrate.
Answer: C
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Genetic map units represent ____
a. absolute physical distances between genes b. locations of different alleles of a gene c. the chromosome on which a given gene is located d. the actual DNA sequence of a gene e. relative positions of genes with respect to one another
"Red tides" are produced by massive blooms of
A. ciliates. B. green algae. C. dinoflagellates. D. apicomplexans. E. amoebozoans.
A male that mates for the optimal time will not fertilize all of the eggs carried by a female.
a. true b. false
Trait controlled by a gene on a sex chromosome; often described as either X-linked or Y-linked.
What will be an ideal response?