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(a) (i) Production of plants and animals that have superior/ greater productivity/ beneficial characteristics than either of their parents.
(ii) Condition in which an individual has more than two sets of chromosomes
(b) - Radiations such as colchicine
- Heavy metals e.g. lead, mercury
- Viruses such as Papilloma
johnmulu answered the question on May 13, 2017 at 06:40
- (a) What is meant by non-disjunction?
(b) Give two examples of continuous variation in humans(Solved)
(a) What is meant by non-disjunction?
(b) Give two examples of continuous variation in humans
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the term allele?
(b) What is a test-cross? (Solved)
(a) What is meant by the term allele?
(b) What is a test-cross?
Date posted: May 13, 2017. Answers (1)
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(b) Describe the following chromosomal mutations. (i) Inversion (ii) Translocation(Solved)
(a) Name two disorders in human caused by gene mutation.
(b) Describe the following chromosomal mutations. (i) Inversion (ii) Translocation
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the term sex-linkage?
(b) Name two sex-linked traits in humans. (Solved)
(a) What is meant by the term sex-linkage?
(b) Name two sex-linked traits in humans.
Date posted: May 13, 2017. Answers (1)
- Give an example of a sex-linked trait in humans on:
Y - CHROMOSOME.
X - CHROMOSOME. (Solved)
Give an example of a sex-linked trait in humans on:
Y - CHROMOSOME.
X - CHROMOSOME.
Date posted: May 13, 2017. Answers (1)
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State two characteristics that researchers select in breeding programme.
Date posted: May 13, 2017. Answers (1)
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Tallness in pea plants is due to a dominant gene. Two tall pea plants were crossed and their F 1 generation were in the ratio of 3 tall: 1 short. using letter T to represents the gene for tallness and t for shortness give the
(a) (i) Genotype of the parents
(ii) Gamete of the parents
(iii) Genotype ratio of the F 1 generation
(b) What is meant by the term testcross in genetic studies?
Date posted: May 13, 2017. Answers (1)
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Name three types of chromosomal mutations.
Date posted: May 13, 2017. Answers (1)
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In a breeding experiment, plants with red flowers were crossed. They produced 123 plants with red flowers and 41 with white flowers
(a) Identify the recessive character. give a reason
(b) What was the genotype of the plants that gave rise to the plants with red and white flowers?
(c) If the white flowers were selfed, what would be the genotypes of their offspring?
Date posted: May 13, 2017. Answers (1)
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State the function of Deoxyribonucleic acid (DNA) molecule.
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Date posted: May 12, 2017. Answers (1)
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Date posted: May 12, 2017. Answers (1)
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(b) State the importance of moulting to an insect. (Solved)
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(b) State the importance of moulting to an insect.
Date posted: May 12, 2017. Answers (1)
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State three factors in seeds that cause dormancy.
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Date posted: May 12, 2017. Answers (1)
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Date posted: May 12, 2017. Answers (1)