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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
Name and define the three types of natural selection.
The largest unit in which gene flow is possible is :
(1) Organism
(2) Population
(3) Species
(4) Genes
Give the scientific name of the organism which is cited as the classical example of "natural selection".
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.
The theory of natural selection for evolution was proposed by ______.
Identify the two organisms which are now extinct and are studied from their fossils.
What is the ancient name for all human beings?
Select the correct statement.
Theory of natural selection dwells on:
Mention four main postulates of Darwin's theory.
