1. Why are not all animals oviparous? Does being viviparous offer any advantage to organisms?
2. The zygote is a single cell and a human adult has about 100 trillion cells. Approximately how many divisions should the zygote undergo to form the adult,
considering the fact that one cell division leads to the formation of two cells?
3. A female ovary produces one ovum at a time every month. This implies that not more than one zygote can be formed at a time. How are twins produced then?Also find out why some twins are identical and some are not.
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Answers
Explanation:
All animals are not oviparous this is due to the fact that these have do not exhibit the capability to lay the eggs. The vivipary animals have the advantage that is fertilization takes place within the female body thus the embryonic development is safe within the mothers womb
: We developed from a single-celled zygote by the process of mitosis and meiosis. The cells continued to divide until you were a multicelled organism. It would take 47 divisions to become an organism with 100 trillion cells
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Answer:
1. All animals are not oviparous this is due to the fact that these have do not exhibit the capability to lay the eggs. The vivipary animals have the advantage that is fertilization takes place within the female body thus the embryonic development is safe within the mothers womb.
2. Explanation: We developed from a single-celled zygote by the process of mitosis and meiosis. The cells continued to divide until you were a multicelled organism. It would take 47 divisions to become an organism with 100 trillion cells
3. Most of the reptiles and amphibians have internal fertilizations but development of embryo occurs outside the body e.g : frog