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(a) - Albinism
- Sickle cell anemia
- Haemophilia
- Colour blindness
(b) (i) Occurs when chromatids/ chromosomes break at two places and when rejoining, the middle piece rotates and joins in an inverted position.
(ii) Occurs when a section of chromatid break off and becomes attached to another chromosome of non-homologous pair
johnmulu answered the question on May 13, 2017 at 05:55
- (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)
- State three aspects that can be used to estimate growth in seedlings (Solved)
State three aspects that can be used to estimate growth in seedlings -
Date posted: May 12, 2017. Answers (1)
- State four reasons why water is significant in seed germination. (Solved)
State four reasons why water is significant in seed germination.
Date posted: May 12, 2017. Answers (1)
- What is meant by the term apical dominance? (Solved)
What is meant by the term apical dominance?
Date posted: May 12, 2017. Answers (1)
- State three factors that contribute to the deceleration phase in the population curve of an organism. (Solved)
State three factors that contribute to the deceleration phase in the population curve of an organism.
Date posted: May 12, 2017. Answers (1)
- In an experiment the shoot tip of a young tomato plant was decapitated as shown in the diagram below. (Solved)
In an experiment the shoot tip of a young tomato plant was decapitated as shown in the diagram below.
(a) State the expected results after 2 weeks.
(b) Give a reason for your answer in (a) above
Date posted: May 12, 2017. Answers (1)
- (a) The state during which a seed cannot germinate even when conditions for germination are suitable is called
(b) The diagram below represents a stage during germination of a seed. (Solved)
(a) The state during which a seed cannot germinate even when conditions for germination are suitable is called
(b) The diagram below represents a stage during germination of a seed.
(i) Name the type of germination illustrated in the diagram.
(ii) State the role of the part labeled x during germination of the seed
Date posted: May 12, 2017. Answers (1)
- Name a growth inhibitor in seeds. (Solved)
Name a growth inhibitor in seeds.
Date posted: May 12, 2017. Answers (1)