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प्रश्न
New species may be formed if
- DNA undergoes significant changes in germ cells
- chromosome number changes in the gamete
- there is no change in the genetic material
- mating does not take place
पर्याय
(i) and (ii)
(i) and (iii)
(ii), (iii) and (iv)
(i), (ii) and (iii)
उत्तर
(i) and (ii)
Explanation -
Gametes or sex cells are the cells involved in sexual reproduction. These gametes fuse to form a zygote which develops into a new organism. So, any change in the DNA or chromosome numbers of the gametes will be transmitted to the new organism. If this new organism with inherited changes in DNA or chromosome number may not reproduce with the existing members, this will be considered a new species.
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संबंधित प्रश्न
Which one of the following is an example of multiple alleles?
(a) Height in pea plant
(b) Hair colour in cattle
(c) Petal colour in four o'clock plant
(d) Wing-size in Drosophila
Mention the Phenotype and Genotype ratios of the offspring in F2 generation.
Complete the following sentence with appropriate word:
___________ is the Father of Genetics.
Explain the statement of Law of dominance is not universal.
Discuss any two points due to which Mendel got success in his experiment?
Identify the percentage of recombinants in F2 generation in the following case.
In Morgan's experiment with Drosophila, the yellow-bodied white-eyed female was crossed with a brown-bodied red-eyed male and their F1 progeny were intercrossed.
Which one of the following characters studied by Mendel in garden pea was found to be dominant?
Read the following and answer from given below:
Prashant wanted to find the genotype of a pea plant bearing purple coloured flowers in his kitchen garden. For this, he crossed purple-flowered plants with white-flowered plants. As a result, all plants which were produced had purple flowers only. Upon selfing these plants, 75 purple flower plants and 25 white flowers plants were produced. Now, he can determine the genotype of a purple-flowered plant by crossing it with a white-flowered plant.
The character i.e., the purple colour of the flowers that appeared in the first filial generation is called ______
Mendel blended his knowledge of science and mathematics to keep count of the individuals exhibiting a particular trait in each generation. He observed a number of contrasting visible characters controlled in pea plants in a field. He conducted many experiments to arrive at the laws of inheritance.
- What do the F1 progeny of tall plants with round seeds and short plants with wrinkled seeds look like?
- Name the recessive traits in the above case.
- Mention the type of the new combinations of plants obtained in F2 progeny along with their ratio, if F1 progeny was allowed to self-pollinate.
OR
If 1600 plants were obtained in F2 progeny, write the number of plants having traits:
- Tall with round seeds.
- Short with wrinkled seeds.
Write the conclusion of the above experiment.
What is the scientific name of the pea plant that Mendel used for his experiments?
