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By Benjamin A. Pierce

With Genetics: A Conceptual technique, Ben Pierce brings a grasp teacher’s stories to the introductory genetics textbook, clarifying this advanced topic by means of concentrating on the massive photograph of genetics innovations and the way these innovations hook up with one another.

The new version gains Pierce’s signature writing kind, proper functions, student-friendly paintings, and emphasis on problem-solving, whereas incorporating the most recent developments in genetics examine. the hot version textual content and LaunchPad media paintings heavily jointly for a continuing adventure for either teachers and scholars

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Extra resources for Genetics : a conceptual approach

Example text

I and n1eeting in the m iddle of the ceU, center at the spindle poles. A spin· dJe.. ---point ensures that each ch mn1oson1e is aligned on the meta phase plate and attached to spindle fibelli fron1 opposite poles. <; by the spindle fi bers. This tension is required for t he cell to pass through the spindle-assembly checkpoint. <; unable to progress to the next stage of the cell cycle. The spindle-assembly checkpoint '' able to detect even a single pair of ch ron1oson1es that are not properly attached to n1krotubules.

Hich is a stable state during \\l'hich ceUs usually n1aintain a constant size. )' can ren"lain in Go for an extended length of tin1e, even indefinite· ly. or they can reenter G 1 and the active cell cycle. vlany eel Li; never enter Go; rather, they cycle cont inuousl)'· After G 1, the cell enters the S phase (for D NA synthesis}, in whk h ead1 chromosome duplicates. S checkpoint has been passed, DNA synthesis must take place belOre the cell can proceed to m itos•s. If DNA synthesis is blocked (by dmgs or by a muta· tion), the cell will not be able to undergo m itos•s.

22a}. lei. One of these nuclei, called the tube nucleus, directs the gm,vth of a pollen tube. d the generative nu· cleus, divides n1itotically to produce t\VO spern1 celLi;. < two haploid nuclei, is the male gametophyte. 22b}, only one of \'1hich sun rives. The nucleus of the surviving niegaspore divides mitotically three times, producing a total of eight hap· loid nuclei that make up the female gametopl11~e. ,n as the en1bryo sac. Division of the cytoplasn1 then pro duces separate cells, one of \'lhkh becon1es the egg.

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