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In this video I go over a quick review of animal reproduction, which can be done in two ways: asexual or sexual. Nearly all animals engage in some form of sexual reproduction, where haploid gametes (motile spermatozoa and stationary ova) merge to create diploid zygotes, which then develop into a hollow sphere called a blastula.
Some animals undergo asexual reproduction, which don't involve the fusion of gametes or the change in the number of chromosomes, often times resulting in a genetic clone. An example is the incredible Hydra which reproduces via fragmentation by budding out into a new Hydra. The Hydra do not appear to die of old age, or age at all, and can regenerate even if chopped up into pieces! 🤯
#science #biology #reproduction #animals #hydra
Timestamps
Animals can reproduce either sexually or asexually: 0:00
Invagination is the folding of an area of exterior cells towards the inside of the blastulla: 1:55
Image of sexual reproduction in dragonflies: 2:45
Some animals undergo asexual reproduction, which doesn't involve the fusion of gametes or change in the number of chromosomes, and often times creates a genetic clone: 3:00
Hydra don't appear to die of old age or age at all, and have regenerative ability: 4:22
Cnidocyte is an explosive cell containing one giant secretory organelle that can deliver a sting to other organism: 5:06
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