Chromatids are
a. attached at the centriole.
b. a pair of chromosomes, one from the
mother and one from the father.
c. attached at their centromeres.
d. identical until crossing over occurs.
e. attached at their centromeres and are
identical until crossing over occurs.
E
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Answer the following statements true (T) or false (F)
1. Molecular homologies indicate that living species evolved from a common ancestor or interrelated group of common ancestors. 2. Selective breeding results from programs designed to modify traits in domesticated species. 3. According to Thomas Malthus, food supplies tend to increase arithmetically while populations tend to increase exponentially, which means that populations will outgrow their food supply. 4. Neutral variation is supported by the observation that most changes in codons occur in the third position within the codon, which often has no effect on the sequence of amino acids in the protein.
What is the most common ecosystem on Earth?
a. marine ecosystems b. freshwater ecosystems c. terrestrial ecosystems d. arboreal ecosystems
Marine bony fish __________ water by osmosis, while freshwater bony fish __________ water by osmosis. Fill in the blank(s) with the appropriate word(s)
Lack of iodine will lead to the development of
a. diabetes insipidus. b. diabetes mellitus. c. a simple goiter. d. acromegaly. e. Graves disease.