YSA Model Paper

 

Subject: Biology                                                                                         Class: X

Answer Key

Section – C

Q. No. 3.   Chapter No. 17

                  a.  Genotype of Dominant = TTPP                          T = tallness

                                   b.   Genotype of recessive = ttpp                                        P = purple

                             c.   Phenotype:-      Short with wihite flower

 c.       Genotype of F1 =  Tt Pp

 The appearance of dominate trait in F1 is due to reason that dominant trait have temporarily masked the expression of recessive trait

	T   P	T   p	t   P	t    p
T   P	T  T  P  P Tall Purple	T  T  P  p Tall. Purple	T  t  P  p Tall. Purple	T   t  P  p Tall. Purple
T   p	T  T  P  p Tall. Pruple	T  T  p  p  Tall. White	T  T  P  p Tall. Pruple	T  t  p   p Tall. white
t    P	T  t  P  P Tal. Prup	T  t  P  p Tall. Purple	t   t  P  P Short. Purple	t  t  P  p Short. Purple
t   p	T  t  P  p Tall. Pruple	T  t  p  p Tall. Puprle	t  t  p  p Short. Purple	t  t  p  p Short. White

 

             Resuts:

                        Tall Purple = 9

                        Tall White = 3

                        Short Purple = 3

                        Short White = 1

                        Ratio = 9:3:3:1

 

Q. No.4     a.   Chapter No. 14

                        Page No. 51

                 

                  b.   Chapter No. 13

                        Page No. 26

 

Q. No. 5.   a.   Chapter No. 20

 

                  b.   Chapter No. 12

                        Page No. 13

 

                  c.   Chapter No. 15

                        Page No. 65

 

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