Speciation: The origin of new species from the exiting ones due to reproductive isolation of a part of its population is called speciation.
A species is defined as a group of interbreeding organisms that produce fertile offspring and are productively isolated from other groups. Reproductive isolation means that sexual reproduction between different species is impossible because of the physical, ecological, behavioral, temporal or developmental reasons.However, inbreeding continues within the isolated populations producing more and more generations. Eventually, the members of these two groups will be incapable of reproducing with each other even if they happen to meet. Over generations, genetic drift accumulates different changes in a sub-population. Also, natural selection may also operate variably in these different geographic locations. e.g. in the territory of one sub-population, crows may get eliminated by eagles.
Different type of barriers causing reproductive isolation are:
. Physical:There may be a sea, mountain or desert between them.
. Behavioural: Populations may have different courtship patterns.
. Temporal (time based) :Plants may be flowering at different times.
. Ecological Species :Inhabit different places and never meet up.
There are four geographic modes of speciation in nature:
The origin of new species from the exiting ones due to reproductive isolation of a part of its population is called ________________ . | |||
Right Option : C | |||
View Explanation |
Which of the following are correct ? (a) The reproductive isolation means physical there may be a sea, mountain or desert between them. (b) The reproductive isolation means behavioral populations may have different courtship patterns (c) Sympatric speciation it refers to the formation of two or more descendant species from a single ancestral species all occupying the same geographical location. | |||
Right Option : D | |||
View Explanation |
Which of the following are correct ? (a) The origin of new species from the exiting ones due to reproductive isolation of a part of its population is called speciation. (b) The example of allopatric speciation is Ensoltina salamanders. | |||
Right Option : A | |||
View Explanation |
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
One of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
It has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
A marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
It was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
My experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Being a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Abhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.