The genotypes of two F1 plants are SsYy, with S and Y alleles dominant to s and y. If fertilization occurs at random ____________________ (number) genotypes and ____________________ (number) phenotypes will result in the F2 generation
Fill in the blank(s) with correct word
nine; four
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If the duration of life on Earth was on a comparative scale of 20,000 days, for how many of those days would the human species be present?
A. 1 B. 100 C. 2000 D. 10,000 E. 20,000
Fine sediment bottoms with silt support a variety of
a. filter feeders. b. suspension feeders. c. epifauna. d. infauna. e. nekton.
A pedigree is useful because it ________
A) shows the genotype of a particular individual B) can help predict the chances of an offspring displaying a particular trait C) shows the phenotype of one individual D) can look at multiple traits at one time
During meiosis, a hexaploid hybrid spontaneously eliminates one set of chromosomes (eliminates 1n). What is the most likely result of this deletion?
A. The hybrid will be able to reproduce with one of the parental species. B. The hybrid will be able to reproduce only by self-fertilization. C. The hybrid will no longer be polyploid. D. The hybrid will no longer be able to reproduce.