Question

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page 83 of 100
question 83
the diploid first cell of a new organism is a:
a gamete
b polar body
c oogonium
d zygote
e morula

Explanation:

To solve this, we analyze each option:

• A. Gametes are haploid sex cells (sperm/egg), not diploid first cells.
• B. Polar bodies are by - products of oogenesis, haploid and not the first cell of a new organism.
• C. Oogonium is a diploid cell in the ovary that gives rise to eggs, but it's not the first cell of a new organism.
• D. A zygote is formed by the fusion of a sperm (haploid) and an egg (haploid), resulting in a diploid cell. It is the first cell of a new organism as it starts the development process.
• E. Morula is a stage of early embryonic development (a ball of cells) that comes after the zygote undergoes several cell divisions, so it's not the first cell.

Answer:

D. Zygote