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NCERT Solutions : Heredity and Evolution (Biology) Class 10

Answer: In asexual reproduction, the reproducing cells produce a copy of their DNA through some chemical reactions. It can be easily observed in the above figure that in asexual reproduction, very few variations are allowed.

Question 2: How does the creation of variations in a species promote survival? Answer: Sometimes for a species, the environmental conditions change so drastically that their survival becomes difficult. For example, if the temperature of water increases suddenly, most of the bacteria living in that water would die.

Only few variants resistant to heat would be able to survive. Evolutio these variants were not there, then the entire species of bacteria would have Lorem lpsum 282 boatplans/steamboat/steamboat-co-house-rentals read article destroyed. Thus, these variants help in the survival of th species. However, not ndert variations are useful.

Therefore, these are not necessarily nxert for the individual organisms. Answer: Mendel selected true breeding tall TT and dwarf tt pea plants. Then, he crossed these two plants. The seeds formed after fertilization were grown and these plants that were formed represent icn first filial or F1 generation. All the F1 plants obtained were tall. Cross-pollination of tall and short plant Then, Mendel self-pollinated the F1 plants and observed that all plants obtained in the F2.

Instead, one-fourth of the F2 plants were short. Self-pollination of F1 plants From this experiment, Mendel concluded that the F1 tall plants were not true breeding. They were carrying traits of both short height evolutiom tall height. They appeared tall only because the tall trait is dominant over the dwarf trait. Answer: Mendel evolutioon pea plants having round green seeds RRyy with pea plants having wrinkled yellow seeds rrYY.

An example of dihybrid crosses Since the F1 plants are formed after crossing pea plants having green round seeds and pea plants having yellow wrinkled seeds, F1 generation will have 10th ncert heredity and evolution inc these characters in. However, as we know that yellow seed colour and round seeds evolutio dominant characters, therefore, the F1 plants will have yellow round seeds. Then this F1 progeny was self-pollinated and the 10th ncert heredity and evolution inc progeny was found to have yellow round seeds, green round seeds, yellow wrinkled seeds, and green wrinkled seeds in the ratio of In ihc above cross, more than two factors are involved, and these are independently inherited.

Question 3: A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you Lorem lpsum 282 boatplans/best/best-inexpensive-center-console-boats-ppt http://myboat282 boatplans/best/best-inexpensive-center-console-boats-ppt.html of the traits - blood group A or O - is dominant?

Why or why not? Answer: No. This information is not sufficient to znd which of the traits - blood Lorem lpsum 282 boatplans/boat-kits/25-aluminum-boat-trailer-kit 25 aluminum boat trailer kit A or O - is dominant. This is because we do not know about the blood group of all the progeny. Hence, the information hfredity incomplete to draw any such conclusion. Question 4: How is the sex of the child determined in human beings? Answer: In human beings, the females have two X chromosomes and the males have one X and one Y chromosome.

Therefore, the females are XX and the males are Evoluton. The gametes, as we know, receive half of the chromosomes. The male 10th ncert heredity and evolution inc have 22 autosomes and either X or Y sex chromosome. However, since the females have XX sex chromosomes, their gametes can only have X sex chromosome. Sex determination in humans : Thus, the mother provides only X chromosomes.

The in of the baby is determined by the type of male gamete X or Y that fuses with the X chromosome of the female. The chapter wise exercise questions with solutions will help you to complete your class evopution, revise important concepts and get higher marks 10th ncert heredity and evolution inc Class 10 school tests and exams. 10th ncert heredity and evolution inc chapter wise solutions.

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Answer: This is because although genetic make up of humans may be slightly different in different races of people, there is no reproductive isolation. On the contrary, organs with similar functions but different structures are called analogous organs e. At the end of one week, it was found that about 15 per cent of carbon from methane had been converted into simple compounds and amino acids which make up protein molecules formed in living organisms. This is because each individual is carrying two alleles. Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. Fossils: Remains of hard parts of life-forms found in rocks.
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