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प्रश्न
Discuss why Drosophila has been used extensively for genetical studies.
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उत्तर
- It can be grown on sunthetic medium.
- It completes its life cycle within a short time (2 weeks).
- It contains only 4 linkage groups.
- It is heterogametic for sex chromosomes.
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संबंधित प्रश्न
Distance between the genes and percentage of recombination shows ______.
Occasionally, a single gene may express more than one effect. The phenomenon is called ______.
What is recombination? Discuss the applications of recombination from the point of view of genetic engineering.
Assertion: When white eyed, yellow bodied Drosophila females were hybridized with red eyed, brown-bodied males; and F1 progeny was intercrossed, F2 ratio deviated from 9 : 3 : 3 : 1.
Reason: When two genes in a dihybrid are on the same chromosome, the proportion of parental gene combinations is much higher than the non-parental type.
Which of the following is NOT a reason why Drosophila melanogaster was chosen for Morgan's linkage experiments?
In Morgan's initial cross, red-eyed females (XR XR) were crossed with white-eyed males (Xr Y). What observation did Morgan make in the F₂ generation?
How does linkage relate to Mendel's Law of Independent Assortment?
In Morgan's dihybrid crosses with Drosophila, the F₂ ratio deviated from the expected 9:3:3:1 ratio. Which genes were being studied in these crosses?
If two genes show a recombination frequency of 1.3%, which of the following statements is most accurate?
According to Morgan's data, genes showing 37.2% recombination (such as white and miniature wing genes) are classified as:
Which scientist, a student of Morgan, used recombination frequency to measure gene distances and create chromosome maps?
Crossing over during meiosis can separate linked genes. This process demonstrates that:
Morgan's experiments with Drosophila demonstrated that genes are physically located on chromosomes by showing:
