pdf, 17,8 MB

pdf, 17,8 MB pdf, 17,8 MB

07.04.2013 Views

METAGENEZA; JEDRNA STANJA: • I. METAGENEZE NI!!: • a) Haplonti ( Enoceličarji): • n (+) + n (-) = 2n R!(n ⇒⇒⇒⇒⇒⇒n(+); n(-)= 2n • b) Diplonti (vretenčarji, kremenaste alge,...) • n(+) + n(-)= 2n⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒R! =n(+); n(-)(gamete)

METAGENEZA; JEDRNA STANJA • II. Metageneza obstaja: • a) Haplodiplonti (mahovi): • n(-) + n(+)gamete = 2n sporofit⇒⇒R! mejospore⇒⇒⇒⇒⇒⇒⇒⇒gametofit • b) Diplohaplonti (semenke in praprotnice) • n(+) + n (-) gamete= 2n (seme; 2n na predkali) ⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒sporofit (rastlina!) R!⇒⇒n(reducirana gametofita na sporofitu !); • gamete sporofit gametofit gamete

METAGENEZA; JEDRNA<br />

STANJA<br />

• II. Metageneza obstaja:<br />

• a) Haplodiplonti (mahovi):<br />

• n(-) + n(+)gamete = 2n sporofit⇒⇒R!<br />

mejospore⇒⇒⇒⇒⇒⇒⇒⇒gametofit<br />

• b) Diplohaplonti (semenke in praprotnice)<br />

• n(+) + n (-) gamete= 2n (seme; 2n na predkali)<br />

⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒sporofit (rastlina!)<br />

R!⇒⇒n(reducirana gametofita na sporofitu !);<br />

• gamete sporofit gametofit gamete

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