Aneuploidies describe:a
a phenomenon that only occurs in plants.
b. a condition in which an extra chromosome is present or one is absent.
c. a defect that is always fatal in humans.
d. an uncommon condition in humans.
e. mutations that almost always have a beneficial effect on an individual.
b
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The largest fraction of saltwater is that which is frozen at the Earth's polar regions.
Answer the following statement true (T) or false (F)
Mycorrhizae are associations between:a
coral animals and dinoflagellates. b. two types of insects. c. fungi and plant roots. d. wasps and orchids. e. epiphytes and rainforest trees.
Which action is unable to produce variation?
A. Crossing over B. Random alignment of chromosomes during meiosis C. Asexual reproduction D. Genetic recombination of alleles E. Sexual reproduction
What best describes the way a single-stranded complementary tail is formed by a restriction enzyme?
A. Same positional cutting sites lead to vector ends. B. Uneven cuts lead to orphaned ends of DNA. C. Staggered cuts in DNA leaves sticky ends. D. Same base cuts lead to 5' end production.