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प्रश्न
Answer each question in ‘One’ sentence only:
Identify which one of the following is a test cross.
विकल्प
Tt × Tt
TT × tt
Tt × tt
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उत्तर
Tt × tt is a test cross.
A test cross is a cross between F1 hybrid (Tt) and a recessive parent (tt).
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संबंधित प्रश्न
Explain the phenomenon that is well represented by Darwin's finches other than natural selection.
The largest unit in which gene flow is possible is :
(1) Organism
(2) Population
(3) Species
(4) Genes
Given alongside are two figures (A and B) showing a phenomenon that was first observed in Manchester before and after the year 1850.
Answer the following:
- What name has been given to this phenomenon?
- Give the common name and the scientific name of the insect involved in this phenomenon.
- Briefly mention why the changes shown in the two figures appeared.
- The following phenomenon provides a classical explanation of a scientific theory given by a certain scientist.
- Name and explain the said theory.
- Give the name of the scientist who gave this theory.
Wild cabbage has evolved into new varieties like cabbage, broccoli, and cauliflower by ______
If the fossil of an organism is found in the deeper layers of earth, then we can predict that
What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor?
Origin of species was written by:
Match List - I with List - II.
| List - I | List II | ||
| (a) | Adaptive radiation | (i) | Selection of resistant varieties due to excessive use of herbicides and pesticides |
| (b) | Convergent evolution | (ii) | Bones of forelimbs in Man and Whale |
| (c) | Divergent evolution | (iii) | Wings of Butterfly and Bird |
| (d) | Evolution by anthropo- genic action | (iv) | Darwin Finches |
Choose the correct answer from the options given below.
Industrial melanism was highlighted by ______.
DDT resistant mosquitoes and different break sizes of African seed cracker finches show ______ type of selection respectively.
