Sexual reproduction is a source of genetic variations & Hermaphroditism
The sexual reproduction is a process by which the living organism produces the individuals with the traits differ from the parents, It occurs through two parental individuals, One is the male and the other is a female, It occurs in most higher living organisms of the plants and the animals.
The gametes formation, The gametes of males and female are formed in the reproductive cells by the meiotic division, and they contain half the chromosomes number (N) of the organism’s reproductive cells (2 N).
The zygote contains the genetic material from both the parents and when it grows, it gives a new offspring with the traits of its parents, The zygote is a cell produced due to the fertilization and it contains the complete number of chromosomes of the living organisms.
The resulted offspring has new genetic traits that combine the parents’ traits, So, sexual reproduction is a source of genetic variation from the parents to the children.
The offspring’s DNA is different, It is prepared for any changes, any diseases that affect some of the offspring will not affect all of them, The DNA variation causes the evolution, while the sexual reproduction takes time and energy to find the mate.
Sexual reproduction is the combination of (the haploid, or a single set of unpaired chromosomes) reproductive cells from two individuals to form a third (diploid, or a pair of each type of chromosome) unique offspring.
The sexual reproduction produces the offspring with the novel combinations of genes, It can be an adaptive advantage in the unstable or the unpredictable environments, As the humans, We are used to thinking of the animals as they have two separate sexes, the male and the female, in the animal kingdom, there are many variations on them.
Hermaphroditism occurs in the animals where one individual has both male and female reproductive parts, The invertebrates, such as the earthworms, the slugs, the tapeworms, and the snails are often hermaphroditic.
Hermaphrodites may self-fertilize or may mate with another of their species, fertilizing each other and both produce the offspring, The self-fertilization is common in the animals that have limited mobility or are not motile such as the barnacles and the clams.