Unitary population

unitary population

1. Unitary popu lation 1 10/5/2018

2. chap.17 metapopulations 2 There are two types of populations : a)  Unitary Populations . b) Modular  Populations . In   unitary populations , each individual is derived from zygote (the product of fertilization of male and female gamete) and the growth of such individuals is determinate and predictable.

3. In  unitary organisms (most animals) there is usually no problem recognizing individuals, because they are both genetically and physiologically separate. Many species of plants and invertebrates, however, have vegetative propagation to produce new individuals, besides sexual reproduction. 10/5/2018 3

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5. Plants derived from one zygote can produce new plants or modules a sexually by means of buds on hallow horizontal roots or by stems that touch the ground.   Individual plants produced by sexual reproduction are genets . Asexually produced individuals derived from the generic parent are called g amets . A group of gamets originating from the same genet makes a clone . Gamets may remain linked to the parent or exist individually.   10/5/2018 5

6. Examples: a) Plants as grass clumps, blackberries, strawberries, that reproduce asexually by runners or stolons . Often never clear whether its a single modular organism or a ramet b) Animals such as corals, hydroids, byrozoans , and tunicates that reproduce asexually by budding. Many primitive metazoans are loosely organized and form modular colonies. c) Fungal mycelia are in the same category, Each hypha is potentially an organism, but the mycelium as a genet can be enormous in size. 10/5/2018 6

7. All gamets are derived from the same zygote and may be considered as one individual or genet.   For practical reasons, in plant population studies individual gamets are counted as and function as individual members of the population. 10/5/2018 7