SPM Biology 2014

Question

2 . Diagram 2 shows a stage of meiosis in an animal cell.

Rajah 2 menunjukkan suatu peringkat meiosis dalam sel haiwan.

(a) (i) Name the stage.

Namakan peringkat itu.

(ii) Describe the chromosomes behaviour during the stage.

Huraikan perlakuan kromosom semasa peringkat itu.

 

(b) Explain the importance of process L.

Terangkan kepentingan proses L.

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(c) (i) Name structure K.

Namakan struktur K.

(ii) What happens to a gamete formed if structure K fails to function in the process of gamete formation?

Apakah yang berlaku kepada gamet terbentuk jika struktur K gagl berfungsi dalam proses pembentukan gamet.

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(d) Mutation is random change in the genetic composition of a cell. A student is needed to produce a pamphlet about mutation. Explain one example of mutation that can be written in the pamphlet.

Mutasi ialah perubahan rawak dalam lomposisi genetik bagi satu sel. Seorang murid dikehendaki menyediakan sebuah risalah berkaitan mutase. Terangkan satu contoh mutase yang boleh ditulis dalam risalah itu.

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Answer ( 1 )

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    2021-02-25T13:34:37+08:00

    2.a)i)Prophase I

    ii)There is crossing over. The chromosomes are exchanging DNA segments between non-sister chromatids.

     

    b)-Process L (crossing over) is important as this ensures variation in the population. 

    -Due to the exchange of DNA segments, new genetic combinations are created. 

     

    c)i)Centriole

    ii)-Centrioles are the central point of which spindle fibres originate. When the spindle fibres attach to the centromere, the centioles migrate away to separate the homologous chromosomes or sister chromatids.

    -If the centrioles fail to function, then gametes will have an abnormal number of chromosomes.

    -Some gametes might have too many or too little, some might not have any chromosomes.

     

    d)-One example of mutation is gene mutation such as insertions, substitutions and deletions.

    -These happen during DNA replication and causes a change in the original DNA base sequence.

    -This results in the production of non-functional/defective proteins or no protein to be produced.

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