mitosis produces new body cells as an organism grows and develops
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What is the Function of Meiosis?
meiosis produces gametes with only half the number of chromosomes.
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how does meiosis result in genetic variation
the shuffling of existing material into new combinations during meiosis is important in creating genetic variation. this includes: independent assortment and crossing over
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what happens during random assortment
the chromosomes that came from the induvisulas two parents are distributed into the into the gametes, completely at random
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what happens during crossing over?
during the first meiotic division, homologous chromosomes come together as pairs and all 4 chromatids come into contact , at these contact points the chromarids break and rejoin. exchanging sections of the DNA.
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What is Chiasmata?
when the chromatids break
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how does fertilization occur in mammals
the nuclei from the gametes have to combine in the process of fertilization, where one sperm enters the ovum, and the gentetic material of the ovum and sperm fuse, forming a zygote
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how does fertilzation occour in plants?
fertilization takes place in the embryo sac within the ovule. the pollen grain germinates on the on the style and the pollen tube grows down through the style towards the ovary.with its growth controlled by the tube nucleus
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What are the names of the 2 nuclei plants contain?
the tube nucleus and the generative nucleus
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what happens during germinisations of pollen
the generative nucleus divides into 2 to form two haploid gamete nuclei which move down the pollen tube.
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what is spermatogenesis?
is the formation of spermatoza
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what is oogensis?
the formation of ova
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what is the two phases during a plants life cycle?
the sporophyte generation is diploid and produces spores by meiosis, and the gametophyte generation which results is haploid and gives rise to gametes.
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Other cards in this set
Card 2
Front
What is the Function of Meiosis?
Back
meiosis produces gametes with only half the number of chromosomes.
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