[7]Reproduction in Flowering Plants

[7]Reproduction in Flowering Plants - REPRODUCTION IN...

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REPRODUCTION IN FLOWERING PLANTS (CHAPTER 36) 1. Flowering plants exhibit alternation of generation. Which of the generation is nutritionally dependent? Which produces the haploid spores and is this by meiosis or mitosis? Which generation is located in the flower? Alternation of generation o Flowering plants have Diploid sporophyte generation Produces haploid spores by meiosis produce a gametophyte plant Haploid located in the flower therefore small and nutritional dependent on the sporophyte generation 2. Seed plants depend on correct timing to allow the crucial environment cues to facilitate the switch between vegetative and reproductive development. Name two of the genes involved and how their transcribed products activate or inactivate the flowering process. Activation and inactivation of genes (e.g. :) Flowering Locus C gene – transcriptional factor that represses flower Flowering locus D gene- transcription leads to his tones de-acetylating and a prompt for transition to reproductive growth Lily flower: three sepals and three petals and are similar in size and color 3. Describe the female and male parts of the flowering. What are the roles of the sepal, petal, and the receptacle? (Fig. 26-1) The male reproductive unit houses the microspores (male gametophyte generation) or pollen grains. Each pollen grain contains two cells with particular roles; what are they? Differentiate between a simple and compound pistil. Floral structure: Receptacle: tip of stalk where most of flower plants are born Sepals: cover and protect flower parts in bud Petals: attract animals pollinators to flower Stamens: produce pollen grains Each stamen consist of a thin stalk (filament) attracted to a saclike structure (anther) where pollen grains form Each microspore(pollen grain) consists of 2 cells o Generative cell divides by mitosis – forms 2 no flagellate male gametes or sperm cells o The other cell (tube cell) produces a pollen tube to transport the sperm to the ovule A simple pistil contains one carpel structure Carpel consists of the ovary, ovules and megasporocytes developing in each ovule A compound pistil contains two or more fused carpels o Pollen Forms in the pollen sacs in anther Each pollen grain contains 2 cells 1 generate two sperm cells 1 produces a pollen tube through o Eggs Structures in the ovule
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1 egg 2 polar nuclei Several other nuclei Egg and polar nuclei participate in fertilization 4. The female gametophyte or embryo sac develops within the ovule; while the immature male gametophyte (pollen grain), develops within pollen sacs in the anthers. Through a process of meiosis and mitosis, each male and female gametophytes mature (Fig 36-3) Describe the female gametophyte or embryo sac after mitosis of the functional megaspore has occurred. Describe the immature male gametophyte after mitosis of the microspore
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[7]Reproduction in Flowering Plants - REPRODUCTION IN...

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