Unformatted text preview: Lecture #17 Date _________ s Chapter 38 ~ Plant Reproduction and Development Sexual Reproduction
s s s Alternation of generations: haploid (n) and diploid (2n) generations take turns producing each other Sporophyte (2n): produces haploid spores by meiosis; these spores divide by mitosis giving rise to male and female haploid plants called.... Gametophytes (n): develop and produce gametes Floral variations
s s s s s s Floral organs: sepals, petals, stamens (male ), carpels (female) complete: all 4 floral organs incomplete: lacking 1 or more floral organs perfect: both stamens and carpels on 1 flower imperfect: lacking either a stamen or carpel monoecious: staminate and carpellate flowers on 1 plant) dioecious: staminate and carpellate flowers on separate plants s Gametophyte development
s Male gametophyte:
microsporocyte (in pollen sacs of anther) divides by meiosis into 41N microspores; mitosis produces a generative cell (sperm) and a tube cell (pollen tube)= a pollen grain s Female...
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