Ncert Solutions Class 10th Heredity And Evolution Data,The Rosie Fishing Boat Moriches Shop,Sailboat Model Kits For Sale 2020 - Plans On 2021
Answer Trait B because in asexual reproduction traits which are present in the previous generation are carried over to next generation with minimal variations. Trait B have higher percentage so it is likeliy to have arisen earlier.
How does the creation of variations in a species promote survival? Answer Variations occur due to sexual reproduction and also due to inaccurate copying of DNA. Depending on the nature of variations, different individuals would have different kinds of advantages. For example, bacteria variants which can withstand heat ncert solutions class 10th heredity and evolution data better chances to survive in a heat wave non-variant bacteria having no capacity to tolerate heat wave.
Thus, variations in a population of a species help in survival of a species. Page No: 1. How do Mendel's experiments show that traits may be dominant or recessive? How do Mendel's experiments show that traits are inherited independently? Answer Mendel crossed pure breeding tall plants having round seeds with pure breeding hereditj plants having wrinkled seeds.
The plants of F 1 generation were all tall with round seeds indicating evoolution the traits of tallness and round seeds were dominant. Self breeding of F 1 yielded plants with characters of 9 tall round seeded, 3 tall wrinkled seeded3 short round seeded and one short wrinkled seeded. Tall wrinkled seeded and short round seeded plants are new combinations which can develop only when ncert solutions class 10th heredity and evolution data traits are inherited independently.
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 which of the traits - blood group A or O - is dominant? Why or why not? Answer No. This information is not sufficient to determine which of the traits - blood group A or O - is dominant.
This is because we do not know about the blood group of all the progeny. Hence, the information is incomplete to draw any such conclusion. 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 XY.
The gametes, as we know, receive half of the chromosomes. The male gametes have 22 autosomes and either X or Y hededity chromosome. However, since the females have XX sex chromosomes, their gametes can only have X sex chromosome. The sex of the baby is determined by the type of male gamete X or Y that fuses with the X chromosome of the female. What are the different ways in which individuals with ncert solutions class 10th heredity and evolution data particular trait may increase in a population?
Why are traits acquired during the life-time of an individual not inherited? Answer This happens because an acquired trait involves change in non-reproductive tissues which cannot be passed on to germ cells or daa progeny. Therefore, these traits cannot be inherited. Why are the ncert solutions class 10th heredity and evolution data numbers of surviving tigers a cause of worry from the point of view of genetics?
Answer The small number of members in a population of tigers do not allow large number of variation to occur which are essential to survival of the species. A deadly disease or calamity may cause death of all the tigers. The small number of tiger also indicates that existing tiger variants are not well adopted to the existing soluions and may extinct soon.
What factors could lead to the rise of a new species? Answer Natural selection, genetic drift and acquisition of traits during the life time of ncert solutions class 10th heredity and evolution data individual can give rise to new species.
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Answer Geographical isolation can prevent the transfer of pollens among different plants.
However, since the plants are self-pollinating, which means that the pollens are transferred from the anther of one flower to the stigma of the same flower or of another flower of the same plant, geographical isolation cannot prevent speciation in this case. Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Answer No, because geographical isolation does not affect much in asexually reproducing organisms.
Asexually reproducing organisms pass on the parent DNA to offsprings that leaves no chance of speciation. However, geographical isolation works as a major factor in cross pollinated species. As it would result in pollinated species. As it would result in accumulation of variation in the two geographically separated population. Give an example of characteristics being used to determine how close two species are in evolutionary terms.
Answer Feathers in some solutione reptiles like dinosaurs, as fossils indicate, evolved to provide insulation in solutiosn weather. However, they cannot fly with these feathers later on birds adapted the feathers to flight. This means that birds are very closely related to reptiles, since dinosaurs were reptile. Can the wing of a butterfly and soultions wing of a bat be considered homologous organs?
Answer The wing of a butterfly and the wing of a bat are similar in function. They help the butterfly and the bat in flying. Since they perform similar function, they are analogous organs hegedity not homologous. What are fossils? What do they tell us about the process of evolution? Answer Fossils are the remains of organisms that once existed on earth. They tell us about the development of the structures from simple structured to complex structured organisms.
They tell us about the phases of evolutions through which they must have undergone in order to sustain themselves in the competetive environment. Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?
Answer A species is ncert solutions class 10th heredity and evolution data group of organisms that are capable of interbreeding to produce a fertile offspring.
Skin colour, looks, and size are all variety of features present in human beings. These features are genetic but also environmentally controlled. Various human races are formed based on these features. All human races have more than enough similarities ncert solutions class 10th heredity and evolution data be classified as same species. Therefore, evolutin human beings are a single species as humans of different colour, size, and looks are capable of reproduction and can produce a fertile offspring.
In evolutionary terms, can we say which among bacteria, spiders, fish and chimpanzees have a 'better' body design? Answer Evolution cannot always be equated with progress or better body designs.
Evolution simply creates more complex body designs. However, this does not mean that the simple body designs are inefficient. In fact, bacteria having a simple body design are still the most cosmopolitan organisms found on earth.
They can survive hot springs, deep sea, and even freezing environment. Therefore, bacteria, spiders, fish, and chimpanzees are all different branches of evolution. Page No: Excercise 1. A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white ncert solutions class 10th heredity and evolution data. The progeny all bore violet flowers, but almost half of them were short.
An example of evolutuon organs is a our arm and a dog's fore-leg. Herediity evolutionary terms, we have more in common with a a Chinese school-boy.
A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes.
On this basis, can we say anything clasw whether the light eye colour trait is dominant or recessive? Answer This information is not sufficient. For considering a trait as dominant or recessive, we need data of at least three generations. This data is about only two generations. How are the areas of study - evolution and classification - interlinked? Daat Classification involves grouping heresity organism into a formal system based on similarities in internal and external structure or evolutionary history.
Two species are more closely ncert solutions class 10th heredity and evolution data if they have more characteristics in common. And if two species are more closely related, then it means they have a more recent ancestor. For example, in a family, a brother and sister are closely related and they have a recent common ancestor i. A brother and ncert solutions class 10th heredity and evolution data cousin are also related but less than the sister and her brother.
This is because the brother and his cousin have a common ancestor i. With subsequent generations, the variations make organisms more different than their ancestors. This discussion clearly proves that we classify organisms according to their resemblance which is similar to creating an evolutionary tree.
Explain the terms analogous and homologous organs with examples. Answer Homologus organs are those organs which have the same basic structural design and origin but have different functions. For Example: The forelimbs of humans and the wings of birds look different externally but their skeletal structure is similar. Analogus organs are those organs which have the different basic structural design and origin but have similar functions.
For Example: The wings of birds and insects. Outline a project which aims to find the dominant coat colour in dogs.
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