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Question : 38
Total: 39
The most obvious outcome of the reproduction process is the generation of individuals of similar design, but in sexual reproduction they may not be exactly alike. The resemblances as well as differences are marked. The rules of heredity determine the process by which traits and characteristics are reliably inherited. Many experiments have been done to study the rules of inheritance.
(i) Why an offspring of human being is not a true copy of his parents in sexual reproduction?
(ii) While performing experiments on inheritance in plants, what is the difference betweenF 1 F 2
(iii) (A) Why do we say that variations are useful for the survival of a species over time?
OR
(iii) (B) Study Mendel's cross between two plants with a pair of contrasting characters.
RRYY×
Round Yellow Wrinkled Green He observed 4 types of combinations inF 2 F 2
(i) Why an offspring of human being is not a true copy of his parents in sexual reproduction?
(ii) While performing experiments on inheritance in plants, what is the difference between
(iii) (A) Why do we say that variations are useful for the survival of a species over time?
OR
(iii) (B) Study Mendel's cross between two plants with a pair of contrasting characters.
RRYY
Round Yellow Wrinkled Green He observed 4 types of combinations in
Solution:
(i) The offspring of human being is not a true copy of his parents in sexual reproduction because in humans, the mixing of genetic material from the gametes of father and mother takes place. Hence, offspring has characters of both parents along with some new recombination.
(ii)F 1 F 2 F 1
(iii) (A) Variations can be useful for the survival of a species over time because they provide the raw material for natural selection to act upon. In any population, there is always some degree of variation, and this variation can be beneficial, neutral, or detrimental to the survival of the individual.
OR
(iii) (B) New combinations were round and green seeds, and yellow and wrinkled seeds. These appear inF 2 F 1 F 2 ′
(ii)
(iii) (A) Variations can be useful for the survival of a species over time because they provide the raw material for natural selection to act upon. In any population, there is always some degree of variation, and this variation can be beneficial, neutral, or detrimental to the survival of the individual.
OR
(iii) (B) New combinations were round and green seeds, and yellow and wrinkled seeds. These appear in
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