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(a) - Sister chromatids separate
- Sister chromatids move to opposite poles of spindle fibre
(b)The significance of meiosis
- Formation of gametes - Meiosis form gametes that are essential for sexual reproduction.
- Genetic information - Meiosis switches on the genetic information for the development of gametes.
- Maintenance of chromosome number - Meiosis maintains the fixed number of chromosomes in sexually reproducing organisms.
- Assortment of chromosomes - In meiosis paternal and maternal chromosomes assort independently. It causes reshuffling of chromosomes and the traits controlled by them.
- Crossing over - It introduces new combination of traits or variations.
- Mutation - Mutations take place due to irregularities of meiotic division.
johnmulu answered the question on May 9, 2017 at 09:35
- During which phase of meiosis does crossing over occur. (Solved)
During which phase of meiosis does crossing over occur.
Date posted: May 9, 2017. Answers (1)
- The chart below shows the number of chromosomes before and after cell division and fertilization in a mammal. (Solved)
The chart below shows the number of chromosomes before and after cell division and fertilization in a mammal.
(a) What type of cell division takes place at Z.
(b) Where in the body of a female does process Z occur.
(c) Name the process that leads to addition or loss of one or more chromosomes
(d) Name the process that leads to addition or loss of one or more chromosomes
(e) State three benefits of polyloidy in plants to a farmer.
Date posted: May 9, 2017. Answers (1)
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(b) State three advantages of asexual reproduction. (Solved)
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(b) State three advantages of asexual reproduction.
Date posted: May 9, 2017. Answers (1)
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Explain why sexual reproduction is important in organisms.
Date posted: May 9, 2017. Answers (1)
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Fig 1 and 2 below represent reproductive organ of plants and an animal respectively.
(a) Which letters in Fig. 1 and Fig. 2 represents the organs that produce female gametes?
Fig. 1:...
Fig. 2...
(b) What is the function of the structure labelled S?
(c) Name the structure labeled W.
(d) Which letters in Fig. 1 and Fig. 2 represents the structures where fertilization takes place?
(e) Which letter in Fig. 1 represents the structure where male gametes are produced?
Date posted: May 9, 2017. Answers (1)
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Date posted: May 9, 2017. Answers (1)
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Date posted: May 9, 2017. Answers (1)
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The diagram below illustrates the structure of the female part of a flower.
(a) Name the part labelled W.
(b) Describe what happens when pollen tubes enters the structure labelled V
(c) What do structures labelled R and T develop into after fertilization?
Date posted: May 9, 2017. Answers (1)
- The photomicrographs below show the various stages of cell division in a certain plant(Solved)
The photomicrographs below show the various stages of cell division in a certain plant
(a) (i) Name the type of cell division illustrated.
(ii) Give a reason for your answer in (a) (i) above.
(b)(i) Name the stage of cell division labelled K.
(ii) Give a reason for your answer in (b) (i) above.
Date posted: May 9, 2017. Answers (1)
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State four characteristics of fruit dispersed by animals.
Date posted: May 9, 2017. Answers (1)
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(a) Name the part labeled B.
(b) Explain the role of the parts labeled A.
Date posted: May 9, 2017. Answers (1)
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Name the flower part that produces gametes.
Date posted: May 9, 2017. Answers (1)
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Name three mechanisms that ensure cross pollination takes place in flowering plants.
Date posted: May 9, 2017. Answers (1)
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The diagram below represents an experimental set-up used by students to investigate a certain process.
Flower Q produced seeds while P did not. Account for the results.
Date posted: May 9, 2017. Answers (1)
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(i) Name the structure labeled W.
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Date posted: May 9, 2017. Answers (1)
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Date posted: May 9, 2017. Answers (1)
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The diagram below shows a stage in mitosis in a plant cell.
(a) Name the stage of mitosis.
(b) Give two reasons for your answer in (a) above
(c) Name the part of the plant from which the cell used in preparation was obtained.
Date posted: May 9, 2017. Answers (1)
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(b) Give three advantages of cross pollination. (Solved)
(a) Explain how the following prevent self-pollination (i) Protandry (ii) Self-sterility
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Date posted: May 9, 2017. Answers (1)
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Date posted: May 9, 2017. Answers (1)
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(b) How are the male parts of wind pollinated flowers adapted to their function? (Solved)
(a) What is meant by the terms (i) Epigynous flower (ii) Staminate flower
(b) How are the male parts of wind pollinated flowers adapted to their function?
Date posted: May 9, 2017. Answers (1)