Statement I: The bridge between one generation and the next are sperm ...
- Bridge between one generation and the next is through sperm and ovum.
- The sperm provides only the nuclear part to the zygote. As such hereditary characters must be carried by nuclear materials.
- There is fusion of the sperm and egg nuclei during fertilization.
- Both the sperm and egg contribute equally in the heredity of the offspring. The sperm provides only the nuclear part to the zygote.
- As such hereditary characters must be carried by nuclear materials. Therefore, chromosomes must carry the hereditary traits.
Hence , the correct answer is option B.
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Statement I: The bridge between one generation and the next are sperm ...
Statement I: The bridge between one generation and the next is sperm and ovum.
- This statement is correct as the fusion of sperm and ovum during fertilization forms a zygote, which develops into a new individual.
Statement II: Both sperm and ovum contribute equally to heredity.
- This statement is incorrect as the ovum contributes more to heredity as it contains more cytoplasm and organelles, including the mitochondria which have their own DNA. The sperm only contributes genetic material in the form of chromosomes.
Statement III: Somatic diploid cells possess two chromosomes as well as two mendelian factors of each type.
- This statement is correct as somatic cells are diploid, meaning they contain two copies of each chromosome and two copies of each gene (known as mendelian factors).
Therefore, only statements I and II are not correct, making option B the correct answer.
Statement I: The bridge between one generation and the next are sperm ...
Third statement is wrong as there should be "2 sets of chromosomes and not just 2 chromosomes in a somatic diploid cell".
The other 2 statements are correct because:-
1) All of us know that zygote is the bridge but we should focus on that the zygote forms by fusion of sperm and ovum and not merely mug up something written in NCERT.
2)We all know that both the sperm and ovum contribute equally in heredity.
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