What features of spermatogonia allow males to produce sperm throughout most of their lives? What would happen if the spermatogonia, instead of producing more spermatogonia, divided and produced four gametes?

What will be an ideal response?


Spermatogonia are diploid stem cells that divide by mitosis to create more diploid spermatogonia. This keeps a reserve of cells that can continue to give rise to more spermatogonia and also to primary spermatocytes to produce sperm. If spermatogonia divided into haploid gametes directly, the reserve of stem cells would be depleted.

Biology & Microbiology

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Bromthymol blue (BTB) is colored below pH 6.0 and colored above pH 7.6

(a) blue, yellow. (b) yellow, green. (c) red, blue. (d) yellow, blue.

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Deoxyribose is

(a) a five-carbon sugar. (b) present in RNA. (c) a nitrogen-containing base. (d) one type of purine.

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The three Domains in which all living things are classified are 

A. Animals, Plants, and Microbes. B. Noneukaryotic, Eukaryotic, and Archaea. C. Eubacteria, Archaea, and Eukarya. D. Bacteria, Plants, and Animals.

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In the standard regression formula of Yi = ?0 + ?1Xi + Ui, which object is most closely tied to the marginal effect of X on Y?

A. Ui B. Yi C. ?0 D. ?1

Biology & Microbiology