SPM Biology 2014

Question

4 . Diagram 4 shows a tall, white flower pea plant is crosses with a short, purple flower pea plant.
Rajah 4 menunjukkan pokok kacang pea tinggi berbunga putih dikacukkan dengan pokok kacang pea rendah berbunga ungu.

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(a) State the phenotype of the parents.

Nyatakan fenotip bagi induk tersebut.

 

(b)(i) Write the genotype of the gametes in the circles provided in Diagram 4.

Tulis genotip bagi gamet dalam bulatan yang disediakan pada Rajah 4.

(ii) State the phenotype of F1 generation.

Nyatakan fenotip bagi generasi F1.

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(c) Table 4 shows the genotype of the F2 generation after F1 generation is crossed with another F1 generation. The total number of F2 offsprings is 16. State the probability of the following F2 generation:

Jadual 4 menunjukkan genotip generasi F2 selepas generasi F1 dikacukkan dengan generasi F1 yang lain. Jumlah balagan anak F2 ialah 16. Nyatakan kebarangkalian generasi F2 berikut:

(i) Tall, white flower pea plant.

Pokok kacang pea tinggi, berbunga putih.

(ii) Tall, purple flower pea plant.

Pokok kacang pea tinggi, berbunga ungu.

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(d) In Table 4, circle genotype of F2 generation for short, purple flower pea plant. Then determine the probability of F2 generation for the phenotype.
Dalam Jadual 4, bulatkan genotip generasi F2 bagi pokok kacang pea rendah berbunga ungu. Kemudian tentukan kebarangkalian generasi F2 bagi fenotip tersebut.

 

(e)  State the phenotype ratio of the offspring of F2 generation in Table 4.

Nyatakan nisbah fenotip anak dalam generasi F2 dalam Jadual 4.

 

(f) Based on Diagram 4 and Table 4, describe Mendel Second Law.

Berdasarkan Rajah 4 dan Jadual 4, huraikan Hukum Mendel Kedua.

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Answer ( 1 )

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    2021-02-25T14:44:42+08:00

    4.a)Plant 1: Tall with white flowers

    Plant 2: Short with purple flowers

     

    b)i)Tb

    tB

    ii)Tall with purple flowers

     

    c)i)3/16

    ii)9/16

     

    d)Genotype: ttBB, ttBb, ttBb

    Probability: 3/16

     

    e)9:3:3:1

     

    f)-Mendel’s Second Law is about independent assortment.

    -When producing gametes, different pairs of alleles will segregate independently from one another.

    -Thus the traits inherited by one offspring will be independent of those inherited by another offspring.

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