1. (a) What is variation ? How is variation created in a population ? How does the creation of variation in a species promote survival ?
(b) Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes.
Answer As Fast as Possible. Thank You...
Answers
DNA copying is not reliable completely because it is a biological process some mistakes may happen in the process of dna copying this results variation . Variation refers to change in dna . Variation s are important because they provide survival advantage . Today there is a completion for survival and inheritance of useful variations.natural selection results in the survival of the fittest and wipes out the rest . By creation of variation species are able to survive in changing environmental conditions
Ex presence of heat resistant variation in bacteria will ensure survival if temperature suddenly rises
Offsprings have the same no.of chromosomes as of parents . The sex cells ie. Egg and sperm is an exception it contains half the no. Of chromosomes so. When they fertilize the no. Of chromosomes add up and result a full set of chromosomes in the zygote.
I hope it makes you clear
Answer: HOPE IT HELPS--
Explanation:
1. (A) > VARIATION IS A TYPE OF MUTATION THAT HAPPENS DURING DNA COPYING IN SOME ORGANISM.
> IT IS CREATED DURING DNA COPYING.
> IT IS PROMOTED BEACUSE DURING HEAT WAVES/GLOBAL WARMING SOME ORGANISMS MAY BE KILLED WHILE VARIATION CAN PREVENT THIS.
(B) THATS BECAUSE HALF OF THE SET OF CHROMOSOMES ARE PRESENT IN THE SPERMS AND THE OTHER HALF IN THE OVUM WHEN THE FUSE TO MAKE A ZYGOTE THE CHROMOSOME BECOME'S EQUAL..