Question

Q. Why can't human adapt different type of reproduction like regeneration or any other type of reproduction.

Answer 1

Because Human body is not capable of any other such reproduction technique.

All organisms, including humans, have the ability to regenerate something in the body. But the process is much more developed in lower organisms such as plants, protists -- unicellular organisms such as bacteria, algae, and fungi � and many invertebrate animals such as earthworms and starfish. These organisms can grow new heads, tails, and other body parts when injured.
Scientists don't know why mammals don't have the same ability to grow new limbs. But they think it is because mammals have more complex biological structures; limb regeneration would require sophisticated controls to ensure that limbs and organs don't grow out of control. Humans, for example, are already equipped with safety mechanisms to ensure that individual cells don't grow uncontrollably. But these mechanisms wear down as a person ages and cancer is often the result.


Let's say… asexual reproduction is done by these available methods:

1. Fission
2. Fragmentation
3. Budding
4. Parthenogenesis

For fission, it's quite hard for a complex multicellular organism like us. All new cells and tissues that will grow into new organism; our clone will derived from every copy of our cells. This probably will change our body configuration. Without proper repairing mechanism, we can die by this procedure.

Fragmentation is usually happened on a simple multicellular organism that every parts or organs inside the body can be split evenly. For us? If you look into human anatomy, our internal organs are not dispersed symmetrically. Other facts: if this mechanism is possible, the new replacement organs will grow later from the missing part in less uniform pattern from the original part. This is the reason of why sometimes starfish that comes from leg division has smaller or bigger other parts of their body.

Budding. Imagine the new human clone of yours grow from a size of pimple. Then it grows into fully functional size. All I see from this, your skin might has to support weight of the new individual and judging a newborn human baby (assuming ~ 9 Kg), and as budding happened randomly from your body surface, don't you think it will pull your skin (can even risky if it might pull apart) and annoyed you a lot?

Parthenogenesis or virgin birth is the most possible thing to happened, in both natural way or by lab. Assuming the produced egg is accidentally not possessing half of genome set (x = n = 23), but in complete set (2x = 2n = 46) and somehow growing directly as it arrived in uterus into fully developed human.