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Colorado Agriscience Plant Science

Colorado Agriscience Plant Science . Unit 4: Plant Reproduction & Genetics Lesson 2: Sexual Reproduction in Plants . Sexual Reproduction . Involves flowers, fruit, & seed Sperm from male flower fuses w/the ovum of the female plant Results in recombination of DNA

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Colorado Agriscience Plant Science

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  1. Colorado AgrisciencePlant Science Unit 4: Plant Reproduction & Genetics Lesson 2: Sexual Reproduction in Plants

  2. Sexual Reproduction • Involves flowers, fruit, & seed • Sperm from male flower fuses w/the ovum of the female plant • Results in recombination of DNA • Results in genetically unique individual • Allows plants to adapt & evolve to environmental change

  3. Pollination • Transfer of pollen from the male to the female part of the plant(s) • How pollination occurs • Self-Pollination • Pollen from a plant pollinates a flower on the same plant • Cross-Pollination • Pollen from a plant pollinates a flower on a different plant

  4. Fertilization • Necessary in flowering plants in order for a seed to develop • Double Fertilization • Unique to plants • Two sperm nuclei involved in fertilization • 1st fertilization occurs when one sperm fuses with the egg creating a zygote • 2nd fertilization occurs when the 2nd sperm nucleolus fuses with the two nuclei in the embryo sac • Results in the formation of the endosperm

  5. Fertilization • Hybrid • Fertilization occurring from parents that are genetically different • Advantages • Best traits of each parent is expressed • Results in Hybrid Vigor • Increased growth, drought resistance, or insect resistance is possible

  6. Fertilization & Genetics • Genetic information is stored in every cell of the plant in DNA • Segments of DNA, called genes, establish the code for plant appearance and traits • Genes are arranged into a set of chromosomes

  7. Fertilization & Genetics • Diploid • Normal sets of cells containing two chromosomes • Haploid • Sex cells contain one chromosome • When fertilization occurs, the single sets of chromosomes are combined into the double set, one from each parent • Results in traits from each parent to be passed on to offspring.

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