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Multiple Choice
A(an) ________ begins as a one-cell structure that is created when a sperm and egg merge.
A
gamete
B
embryo
C
blastocyst
D
zygote
Verified step by step guidance
1
Step 1: Understand the question. The problem is asking for the term that describes a one-cell structure formed when a sperm and egg merge.
Step 2: Recall the process of fertilization. During fertilization, a sperm cell and an egg cell combine their genetic material to form a single-celled structure.
Step 3: Review the definitions of the terms provided:
- Gamete: A reproductive cell (sperm or egg) that carries half the genetic material.
- Embryo: A multicellular organism in early development after the zygote stage.
- Blastocyst: A structure formed in the early development of mammals, consisting of a hollow ball of cells.
- Zygote: A single-celled structure formed immediately after the sperm and egg merge.
Step 4: Identify the correct term based on the definitions. The one-cell structure formed after the sperm and egg merge is called a zygote.
Step 5: Conclude that the correct answer is 'zygote' because it matches the description of a one-cell structure formed during fertilization.