Give reasons for the appearance of new combinations of characters in the F2 progeny....
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Determine the number of 5-card combinations out of a deck of 52 cards if each selection of 5 cards has exactly one king.
1 king can be selected in 4C1 ways 4 other cards can be selected in 48C4 ways ∴ No of card combination out of a 52 cards each combination having exactly one king. ⇒4C1×48C4
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Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.
(a) Sexual reproduction involves two parents with different sets of characters (b) The gene combinations are different in gametes.
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Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be
(b) self pollination
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A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because
(a) tallness is the dominant trait
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Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round,
(b) (i) and (iv)
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In the following crosses write the characteristics of the progeny
(a) Round, yellow (b) Round, yellow Round, green Wrinkled, yellow Wrinkled, green (c) Wrinkled, green (d) Round, yellow
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Given 5 different green dyes ,four different blue dyes and three different red dyes,the number of combinations of dyes which can be chosen
Green dyes =5 Blue dyes =4 Red dyes =3 The no of ways of choosing of at least one green and one blue is =(25−1)×(24−1)×23 ⇒(32−1)×(16−1)×8 ⇒31×15×8 ⇒3720
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From 5 different green balls, four different blue balls and three different red balls, how many combinations of balls can be chosen
Total combination of balls = 212 Combination of balls with no green balls = 27 Combination of balls with no blue balls = 28 Combination of balls with no blue balls and no green...
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Why did Nlendel choose garden pea for his experiments ? Write two reasons. (ii) List two contrasting visitrle characters of garden pea
(i) Mendel choose garden pea for his experiments because : (a) Pea plant is small and easy to grow (b) A large number of true breeding varieties of pea plant are available. (c)...
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If n^Cr denotes the number of combinations of n things taken r at a time,
(a) : Consider nCr – 1 + 2nCr + nCr + 1 = (nCr – 1 + nCr) + (nCr + nCr + 1) = n + 1Cr + n + 1Cr...
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