One of the most interesting aspects of earthworms is their sexuality. Earthworms are simultaneous hermaphroditesmeaning worms have both male and female reproductive organs. During sexual intercourse among earthworms, both sets of sex organs are used by both worms.
Reproduction is a function of living things that ensures the survival of the species by producing new organisms. It results in the passing on of genetic information to a new generation. Asexual reproduction is the process of reproducing cells or organisms without the union of separate individuals.
The birds, the bees, chimpanzees, humans — we all do it, but few people realise that sexual reproduction actually first evolved in creatures vastly different to ourselves. View image of What is the real story of the birds and bees? Credit: Vivien Cumming.
Evolutionary biologists at the University of Toronto U of T have found that environment plays a key role in determining whether a species opts for sexual over asexual reproduction. Whatever evolutionary force maintains this mode of reproduction across such a diversity of life must be one of the most powerful and important factors in biology. Our work suggests that spatial heterogeneity is one of these key factors. Furthermore, sexual reproduction resulted in organisms that are adept across different environments, with different characteristics and more robust genetic constitutions than their asexually-reproducing counterparts.
One of the requirements for all living things is reproduction. Sexual reproduction increases the diversity within a population and gives natural selection more to choose from in deciding which is the best suited for that environment. Here are four ways individuals can undergo sexual reproduction.
Living things are able to reproduce themselves. If organisms fail to do this, populations will diminish and disappear as their members die from old age, disease, accidents, predation, etc. It is a fundamental law of biology that living things can only be produced by other living things; every living organism owes its existence to the reproductive activities of other organisms.
October 14, Evolutionary biologists at the University of Toronto have found that environment plays a key role in determining whether a species opts for sexual over asexual reproduction. Whatever evolutionary force maintains this mode of reproduction across such a diversity of life must be one of the most powerful and important factors in biology.
Organisms reproduce to pass on their genes and create new members of their species. If the organisms of a species all fail to reproduce then the species may become extinct. Asexual reproduction does not involve sex cells or fertilisation.
Animal reproductive systemany of the organ systems by which animals reproduce. The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with other individuals in the environment to maintain themselves for a period of time sufficient to enable them to produce tissue nonessential to their own survival, but indispensable to the maintenance of the species.
Sexual reproduction involves two parents and the joining of male and female gametes during fertilisation. The offspring inherit a mixture of genes from both parents, so are different to each other and their parents. The advantages of sexual reproduction:. In asexual reproduction there is only one parent.