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प्रश्न
Give reasons why acquired characters are not inherited.
उत्तर
Acquired characters are those characters that an organism gets during its lifetime. These characters do not bring any change in the DNA of germ cells so these characters are not inherited. Acquired traits are the changes that occur in non-reproductive tissues, thus they cannot be passed on to DNA of germ cells. Hence, these characters do not produce a change in the genes of germ cells, so they cannot be inherited.
Example : Swimming skills do not have any genetic changes in the individual who knows it. So it cannot pass from one generation to another as genetic code is the only way organisms pass information to the next generation.
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Pooja has green eyes while her parents and brother have black eyes. Pooja’s husband Ravi has black eyes while his mother has green eyes and father has black eyes.
a. On the basis of the above given information, is the green eye colour a dominant or recessive trait? Justify your answer
b. What is the possible genetic makeup of Pooja’s brother’s eye colour?
c. What is the probability that the offspring of Pooja and Ravi will have green eyes? Also, show the inheritance of eye colour in the offspring with the help of a suitable cross.
OR
c. 50% of the offspring of Pooja’s brother are green eyed. With help of cross show how this is possible.
