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(a) These are genes located on sex-chromosomes hence are transmitted (and inherited) together with those that determine sex of the organism
(b) Colour blindness,
- Haemophilia
- Muscular dystrophy
- Premature baldness - tuft of hair in the pinna and nose
johnmulu answered the question on May 13, 2017 at 07:38
- (a) Differentiate between the following terms: (i) Dominant gene and recessive gene;
(ii) continuous variation and discontinuous variation.
(b) What would be the expected results from a test cross? (Solved)
(a) Differentiate between the following terms: (i) Dominant gene and recessive gene;
(ii) continuous variation and discontinuous variation.
(b) What would be the expected results from a test cross?
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the term non-disjunction?
(b) Give an example of genetic disorder caused by: (i) Non-disjunction; (ii) Gene mutation. (Solved)
(a) What is meant by the term non-disjunction?
(b) Give an example of genetic disorder caused by: (i) Non-disjunction; (ii) Gene mutation.
Date posted: May 13, 2017. Answers (1)
- State two advantages of hybrid vigour (Solved)
State two advantages of hybrid vigour
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the following terms (i) hybrid vigour (ii) Polyploidy?
(b) State two causes of chromosomal mutations. (Solved)
(a) What is meant by the following terms (i) hybrid vigour (ii) Polyploidy?
(b) State two causes of chromosomal mutations.
Date posted: May 13, 2017. Answers (1)
- (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)
- (a) Name two disorders in human caused by gene mutation.
(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)
- State two characteristics that researchers select in breeding programme. (Solved)
State two characteristics that researchers select in breeding programme.
Date posted: May 13, 2017. Answers (1)
- 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 (Solved)
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)
- Name three types of chromosomal mutations. (Solved)
Name three types of chromosomal mutations.
Date posted: May 13, 2017. Answers (1)
- In a breeding experiment, plants with red flowers were crossed. They produced 123 plants with red flowers and 41 with white flowers(Solved)
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)
- State the function of Deoxyribonucleic acid (DNA) molecule. (Solved)
State the function of Deoxyribonucleic acid (DNA) molecule.
Date posted: May 12, 2017. Answers (1)
- State three factors that contribute to the deceleration phase in the population phase in the population curve of an organism. (Solved)
State three factors that contribute to the deceleration phase in the population phase in the population curve of an organism.
Date posted: May 12, 2017. Answers (1)
- What is seed dormancy?(Solved)
What is seed dormancy?
Date posted: May 12, 2017. Answers (1)
- State three roles of auxins in a plant stem. (Solved)
State three roles of auxins in a plant stem.
Date posted: May 12, 2017. Answers (1)
- (a) State two differences between complete and incomplete metamorphosis.
(b) State the importance of moulting to an insect. (Solved)
(a) State two differences between complete and incomplete metamorphosis.
(b) State the importance of moulting to an insect.
Date posted: May 12, 2017. Answers (1)
- State three factors in seeds that cause dormancy. (Solved)
State three factors in seeds that cause dormancy.
Date posted: May 12, 2017. Answers (1)
- State the role of the following hormones in the life cycle of insects:(Solved)
State the role of the following hormones in the life cycle of insects:
Date posted: May 12, 2017. Answers (1)