-
Define reproduction in animals.
Define reproduction in animals. What are the two modes of reproduction?
-
2 Replies
-
Reproduction in animals is the biological process in which their parents gave birth to the new individual called offsprings. Not only in animals but plants also undergo this process to produce offsprings. Every organism, be it plants or animals are the results of reproduction. There are two modes of reproduction in plants and animals and they are known as:
1. Sexual Reproduction: The most common mode of reproduction in animals is Sexual Reproduction. In this process, both male and female play their significant roles. Most of the animals reproduce sexually in which the male sperm unites with the female egg to make a zygote, which shares its DNA with the cells of both the parents. Certain invertebrates reproduce with the process called self-reproduction in which they fertilize the egg with their own sperm. Humans and many animals reproduce sexually by the fusion of sperm with the ovum to form a zygote and this process is called fertilization.
2. Asexual Reproduction: It is the mode of reproduction in which only one parent is involved to produce offsprings. It produces genetically identical offsprings. The different modes of asexual reproduction in animals are gemmules, fragmentation, regeneration, parthenogenesis. It helps animals to continue their species.
-
Reproduction is a process through which organisms gives rise to there young ones which are same as there single parent or have mixed characteristics of there parents. Reproduction helps to maintain the continuity of a particular species.
There are two ways in which organisms can reproduce offsprings:-
1. Asexual reproduction- This is the process by which offsprings are produced without the fusion or production of gametes. Asexual reproduction takes place where there is only one parent. The offsprings are identically same as there parent and are called clones. Asexual reproduction is a simple and fast process.
Eg- spore formation, parthenogenesis, vegetative propagation, fragmentation etc.
2. Sexual reproduction- This is the process by which the male gamete which is the sperm and the female gamete which the ovary fuse together to produce the offspring. The offspring contains characteristics of both the parents hence are not exactly same as there parents. Sexual reproduction is a complex and slow process. Thorugh sexual reproduction there is genetic variation in the offspring.
A disease cannot effect the whole species.
Eg- in human beings,dogs etc.
The organisms which can produce 2 distinct type of gametes are called anisogamous which contain the male gametes sperm and female gamete ovary. Eg- plasmodium, vertebrates.
The organisms in which the gametes are identical are called isogamous species. Eg- chlamydomonas, algae etc
There are many organisms that can reproduce sexually as well as asexually like hydra, jellyfish, yeast and many more depending on the conditions they are in.
In human there are germ cells called sperm and ova respectively for male and female. While intercourse the sperm reaches the ovum and fertilises it to form the embryo which later forms zygote. And as the time passes by the zygote grows to form an individual baby.
There are lab based methods through which couple can conceieve who are not able to conceive naturally. Ex- IVF.
-
