Bio- Ch 43 Anatomy. nutrient

Bio- Ch 43 Anatomy. nutrient - Biology:Plantscont.

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Biology: Plants cont. 15:27 Other mechanisms used by bisexual flowers to avoid self-fertilization: Genetic self-incompatibility, gauged by S-genes (50-60 alleles, diploid plant gets 2  alleles). Same mating types cannot breed. Helps prevent inbreeding and produces  variation.  Fungi has a similar mating mechanism.  Mating types have to be different or not closely related. If they are different enough,  mating can take place.  Development of the seed and fruit: The first mitotic division of the zygote is asymmetric. Now has 2 copies of every  chromosome and divides by mitosis and becomes polar. Those two diploid cells begin to  become different.  This asymmetry provides the first environmental (place) difference experienced by the  differentiating cells and establishes the root-shoot axis.
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Bio- Ch 43 Anatomy. nutrient - Biology:Plantscont.

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