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Question : 14
Total: 15
Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular trait in each generation. He observed a number of contrasting visible characters controlled in pea plants in a field. He conducted many experiments to arrive at the laws of inheritance.
(a) What do the Fl progeny of tall plants with round seeds and short plants with wrinkled seeds look like?
(b) Name the recessive traits in above case.
(c) Mention the type of the new combinations of plants obtained in F2 progeny along with their ratio, ifFl
OR
If 1600 plants were obtained in F2 progen write the number of plants having traits.
(i) Tall with round seeds
(ii) Short with wrinkled seeds
Write the conclusion of the above experiment.
(a) What do the Fl progeny of tall plants with round seeds and short plants with wrinkled seeds look like?
(b) Name the recessive traits in above case.
(c) Mention the type of the new combinations of plants obtained in F2 progeny along with their ratio, if
OR
If 1600 plants were obtained in F2 progen write the number of plants having traits.
(i) Tall with round seeds
(ii) Short with wrinkled seeds
Write the conclusion of the above experiment.
Solution:
(a) The F1 progeny were all tall plants with rounded seeds as Mendel had selected pure breeds and tall plant and round seeds are the dominant traits.
(b) Short plants, wrinkled seeds, are the recessive traits.
(c) New combinations of F1 progeny was allowed to self pollinate are as follows:
Tall and round= 9
Tall and wrinkled= 3
Short and Round= 3
Short and wrinkled= 1
Ratio= 9 : 3 : 3 : 1
OR
Ratio inF 2 9 : 3 : 3 : 1
(i) Tall with round seeds will be 900 plants
(ii) Short with wrinkled seeds will be 100 plants
The conclusion of this experiment was that during recombination, mixing of alleles do not occurs and one trait does not interfere with the inheritance of the other one. This gave the law of independent assortment.
(b) Short plants, wrinkled seeds, are the recessive traits.
(c) New combinations of F1 progeny was allowed to self pollinate are as follows:
Tall and round
Tall and wrinkled
Short and Round
Short and wrinkled
Ratio
OR
Ratio in
(i) Tall with round seeds will be 900 plants
(ii) Short with wrinkled seeds will be 100 plants
The conclusion of this experiment was that during recombination, mixing of alleles do not occurs and one trait does not interfere with the inheritance of the other one. This gave the law of independent assortment.
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