GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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disappeared after the second generation
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appeared only in the first generation of a cross between two pure-breeding plants expressing contrasting forms of a trait
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could be produced only if one of the parents expressed the recessive trait
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were pure breeding
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Detailed explanation-1: -His key finding was that there were 3 times as many dominant as recessive traits in F2 pea plants (3:1 ratio). Mendel crossed pure lines of pea plants. Dominant traits, like purple flower colour, appeared in the first-generation hybrids (F1), whereas recessive traits, like white flower colour, were masked.
Detailed explanation-2: -Fundamental theory of heredity Mendel found that paired pea traits were either dominant or recessive. When pure-bred parent plants were cross-bred, dominant traits were always seen in the progeny, whereas recessive traits were hidden until the first-generation (F1) hybrid plants were left to self-pollinate.
Detailed explanation-3: -A true breeding line is one that has undergone self-pollination and shows a stable trait inheritance for several generations.
Detailed explanation-4: -During this time, Mendel observed seven different characteristics in the pea plants, and each of these characteristics had two forms (Figure 3). The characteristics included height (tall or short), pod shape (inflated or constricted), seed shape (smooth or winkled), pea color (green or yellow), and so on.