Heredity and evolution Worksheet-18
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How human evolution took place over the years?
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Explain Mendel's experiment with peas on inheritance of traits considering only one visible contrasting character.
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Explain Mendel's experiment with peas on inheritance of traits considering two visible contrasting characters.
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Explain with an example how traits get expressed.
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Draw a schematic diagram to explain the independent inheritance of two separate traits, shape and colour of seeds.
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How do homologous characteristic help to identify an evolutionary relationship between different species?
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Explain the importance of variations.
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On the basis of the possibilities of combination of the sex chromosomes, what percentage probability does a couple have of having a son or a daughter? Show the same by making a cross.
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What is a sex chromosome? Name the two types of sex chromosomes. Mention the sex chromosomes present in males and females.
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Explain with an example how variation took place due to inheritance.
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'Non-living-material must have given rise to life'. Describe with an example.
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What role does sexual reproduction play in evolution?
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How do Mendel's experiment show that traits may be dominant or recessive?
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How do Mendel's experiments show that traits are inherited independently?
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How is the sex of the child determined in human beings?
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What are the different ways in which individuals with a particular trait may increase in a population?
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Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?
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Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
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Give an example of characteristics being used to determine how close two species are in evolutionary terms.
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In evolutionary terms, can we say which among bacteria, spiders, fish and chimpanzees have a 'better' body design? Why or why not?
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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 about whether the light eye colour trait is dominant or recessive? Why or why not?
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How are the areas of study - evolution and classification - interlinked?
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Explain the terms analogous and homologous organs with examples.
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Explain the importance of fossils in deciding evolutionary relationships.
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Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?
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(i) What is 'genetics'?
(ii) Give the common name of the plant on which Mendel performed his experiments.
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(i) What are 'chromosomes'? Where are they located in the cells?
(ii) What is a sex chromosome?
(iii) Explain the mechanism of sex determination in human beings.
OR
(i) Analogous organ
(ii) Natural selection
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What are fossils? How does the study of fossils provide the evidence in favour of Organic Evolution?
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What are homologous organs? How do they differ from analogous organs? How does the study of comparative anatomy provide evidence in favour of Organic Evolution?
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How is the sex of a new born individual determined? Explain with the help of a diagram.
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Explain with example how characteristics of a population changes over the years for the following situations
(a) To gain survival advantage
(b) Due to accidental survival
(c) Temporary change of characteristics.
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What are fossils? What do they tell us about the process of evolution?