Question
Discuss why Drosophila has been used extensively for genetical studies.
✓
Answer
Morgan worked with the tiny fruit files, Drosophila melanogaster, which were found very suitable for such studies, as:
- They could be grown on simple synthetic medium (ripe banana) in the laboratory.
- They complete their life cycle in about two weeks.
- A single mating could produce a large number of progeny flies.
- There was a clear differentiation of the sexes – the male and female flies are easily distinguisable.
- It has many types of hereditary variations that can be seen with low power microscopes.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Explain the following with reason :
A few statements are given below followed by a set of terms in a box. Pick the correct term and write it against the appropriate statement,
- Mating of closely related individuals within the same breed.
- Mating of animals of same breed but having no common ancestors on either side for 4-6 generations.
- Mating of animals of two different species.
- Breeding of animals belonging to different breeds.
- Cross breeding.
- Inter-specific hybridization.
- Out breeding.
- Out crossing.
- Inbreeding.
The graph given below shows the variation in the levels of ovarian hormones during various phases of menstrual cycle:
Reason out why A peaks before B.
Reason out why A peaks before B.
Discuss the various types of positive interactions between species.
Explain polygenic inheritance pattern with the help of a suitable example.
Species diversity decreases as we move away from the equator towards the poles. What could be the possible reasons?
- A mere 0.1 percent impurities make domestic sewage unfit for human consumption. Categorise the types of impurities with one example each.
- What is polyblend?
- Why does a greenhouse warm up?
Vivipary automatically limits the number of offsprings in a litter. How?
What is integrated waste water management? Discuss its advantage.
Rose plants produce large, attractive bisexual flowers but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.
Both these plants - rose and tomato - both selected by human beings for different characteristics, the rose for its flower and tomato for its fruit. Roses, being vegetatively propagated do not need to produce seeds.
Both these plants - rose and tomato - both selected by human beings for different characteristics, the rose for its flower and tomato for its fruit. Roses, being vegetatively propagated do not need to produce seeds.