Why 2 sperm cells seed plants


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Indeed, mammals with high male competition for mating with promiscuous females, generally have larger testes for increased sperm production, whereas in species with low intraspecific male competition, the testes are smaller, and sperm production is lower [ ]. Cell 29 , — While in animals gamete pronuclei approach each other and nuclear tracking along microtubules and centrosome-dependent nuclear positioning [ ] governs their movement and positioning for karyogamy, the migration of nuclei following plasmogamy is considerably different in flowering plants, which lack centrosomes. Although the mutant cdka;1 central cell showed mitotic divisions upon egg cell fertilization, it appeared mostly unfertilized, and endosperm proliferation and thereby seed development stopped after a certain time point. These are used by papilla cells to control pollen germination, by transmitting tract cells during pollen tube growth and by the ovule and female gametophyte cells during the last steps of pollen tube journey. Getting there first, and outcompeting other males is often enhanced by increased sperm production, and hence the conflict of self-interest between the sexes.
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What structure of a flower contains the male gametes? Why are there 2 gametes (sperm) in each?


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Gymnosperm

Pine sporophyte and gametophyte. Gymnosperms Plant taxonomy Extant Late Devonian first appearances. This image is copyright Dennis Kunkel at www. There only 2 species of cycads native to the U.
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Why 2 sperm cells seed plants
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