Double Fertilization | Biology
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4 سال پیش
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Double fertilization- Male gametophyte produces
Double fertilization- Male gametophyte produces two male gametes in angiosperms, out of them one unites with the female gamete and the other unites with the secondary nucleus. It is called double fertilization as both gametes take part in fertilization and fertilization occurs twice. During double fertilization, a pollen tube with two male gametes and tube nucleus enters the embryo sac on reaching the ovule, through the micropylar end.
After this, the tip of the pollen tube bursts and two male gametes are discharged. Out of these two male gametes, one unites with the egg of female and the other unites with the secondary nucleus of the embryo sac, forming triploid or triple fusion nucleus, called the primary endosperm nucleus. The other male gamete fuses with the egg nucleus causing fertilization, resulting in the formation of a diploid zygote or diploid oospore. This is called syngamy. The process involving the fusion of the haploid nucleus of male gamete with the diploid secondary nucleus to form a triploid primary endosperm nucleus is called triple fusion.
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After this, the tip of the pollen tube bursts and two male gametes are discharged. Out of these two male gametes, one unites with the egg of female and the other unites with the secondary nucleus of the embryo sac, forming triploid or triple fusion nucleus, called the primary endosperm nucleus. The other male gamete fuses with the egg nucleus causing fertilization, resulting in the formation of a diploid zygote or diploid oospore. This is called syngamy. The process involving the fusion of the haploid nucleus of male gamete with the diploid secondary nucleus to form a triploid primary endosperm nucleus is called triple fusion.
For more videos, online classes, 24X7 Doubts solving and Mock tests, Visit Toppr - The better learning app.
#BetterLearning on the Toppr app, download now
Google Play: http://bit.ly/2vRBqcb
App Store: http://apple.co/2vpRAr9
Website: https://www.toppr.com/
Download Doubts on Chat App:
Android Play Store: http://bit.ly/2B6w7oy
iOS App Store: http://apple.co/2ziAA75
Facebook: Facebook: beingToppr
Twitter: Twitter: mytoppr
Instagram: Instagram: mytoppr
LinkedIn: LinkedIn: toppr-com
4 سال پیش
در تاریخ 1399/01/08 منتشر شده
است.
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