The normal cell cycle for body cells follows a prescribed timeline based on genetic information contained within the cells. Suppose the cell cycle continues on with mitosis occurring even when it should not. What might happen?
A) A gamete may be produced.
B) A tumor might grow.
C) An extra limb may form.
D) Viruses might replicate.
Ans: B) A tumor might grow.
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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). Based on the principle of independent assortment, 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. 3 yellow-eyed with thumbs : 1 red-eyed without thumbs
This phylum of nonvascular plants has about 6000 known living species. It includes the genus
Marchantia, whose members can reproduce asexually via cups called gemmae.
a. Hepatophyta b. Pterophyta c. Bryophyta d. Lycophyta e. Anthocerophyta
Nephridia are
a. circulatory organs. b. respiratory organs. c. excretory organs. d. endocrine organs. e. part of the nervous system
In a diploid population, selection is likely to be stronger than drift when s (the selective advantage in this case) is:
a. > 1/2Ne. b. > Ne. c. > 2Ne. d. > 4Ne. e. > Ne/4.