Arthropods have ____
a. exoskeletons
b. endoskeletons
c. hydrostatic skeletons
d. segmental skeletons
e. squishy skeletons
ANSWER: a
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Boa constrictors on an island are an example of a(n) ______.
A. cell B. organ C. organism D. population E. ecosystem
Organisms with high levels of parental care ____________________
a. tend to produce fewer offspring b. have fewer surviving offspring c. must be monogamous d. provide milk for their developing young
Genetic studies of an animal show that eye color is controlled by an autosomal gene with the dominant allele (R) for
red eye color and the recessive allele (r) for yellow eye color. A second autosomal gene has the dominant allele (T) for paws with thumbs and the recessive allele (t) for paws without thumbs. The genetic cross RRTT x rrtt creates offspring with genotype RrTt. One of those dihybrids is mated in a testcross (RrTt x rrtt). If the two genes are completely linked (no recombination occurs between them), then the testcross should produce offspring with the phenotype ratio ____.
a. 3 red-eyed with thumbs : 1 yellow-eyed without thumbs. b. 1 red-eyed with thumbs : 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs. c. 1 red-eyed with thumbs : 1 yellow-eyed without thumbs. d. 9 red-eyed with thumbs : 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thumbs. e. 1 yellow-eyed with thumbs : 1 red-eyed without thumbs.
The three principal organs of seed plants are
A. roots, leaves, and flowers B. stems, leaves and roots C. stems, fruits, and flowers D. roots, stems, and flowers