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Comparison Asexual and Sexual Reproduction Asexual Number of Parents What do Offspring Look Like? DNA Sexual Comparison Asexual and Sexual Reproduction Asexual Sexual Usually 2 parents or One parent combine 2 half cells Offspring is identical Offspring is different to parent from parent Same DNA as parent DNA is combination of DNA of 2 parents Asexual Reproduction Bacteria and some Protists Binary fission - a ‘parent individual’ splits into two independent organisms Asexual Reproduction Some simple Animals Hydra – a small jellyfish Budding - a new individual grows on a ‘parent’ Asexual Reproduction Some simple Animals Starfish Regeneration – an individual can grow a new part Asexual Reproduction Fungi Most reproduce asexually. They produce a complete cell called spore. Whereas a sperm or egg have ½ the DNA of the parent, the spore has all the DNA of the one parent. Asexual Reproduction Plants reproduce sexually but Can sometimes reproduce asexually Vegetative reproduction - A new plant can grow often from a part of a plant. Asexual Sexual DNA DNA Sperm DNA + DNA Egg DNA Zygote Asexual Sexual DNA DNA DNA + DNA All offspring identical – no variation DNA DNA or All offspring different– considerable variation DNA DNA or DNA DNA Sexual Reproduction Is it such a good idea?? Advantages - produced unique genetic combinations in different individuals x Unique offspring can cope with different niches and a changing environment Sexual Reproduction Is it such a good idea?? Disadvantages - cost of meiosis - lose 50% of your genes every generation Sexual eggs sperm Advantage: Offspring can look different 2 of each gene in next generation Compare sexual and asexual reproduction Sexual Asexual Good in variable environments Easier to Adapt Good in stable environments Only need 1 Parent
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