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Question

AaBboct AaB Heading 2 12 .2 . H .11Normal]TAlo Spac._ Heading 1 Title Paragraph 1. Animal development includes a series of consecutive stages.Please choose the answer that states the correct order of these stages. (I point) A. Fertilization-) cleavage neurulation gastrulation organogenesis B: Fertilization-> neurulation "> gastrulation cleavage organogenesis C: Fertilization cleavage gastrulation neurulation organogenesis 2. Which of the following is an immediate consequence of fertilization (right after fusion of the egg and sperm)? (1 point) A. The combination of the pronuckei from sperm and egg to build the genome of a new organism C. Formation of the neural tube D. All of them B. Which of the following is correct about the events during cleavage in frog embryo? (1 point) A The zygote undergoes fast mitotic division to produce many smaller cells without change in total cytoplasm volume B: The zygote increases rate of protein synthesis and undergoes rapid meiotic division to generate more cells C: The zygote duplicates itself rapidly

Explanation / Answer

1. C. fertilization, cleavage, grastrulation, neurulation organogenesis

2. A, The combination of pronuclei from sperm and egg.to build genome of new organism.

Formation of neural tube occurs in neurulation and Initiation of cell migration to form 3 germ layer occurs in gastrulation. So after fertilization zygote will form by pronuclei from sperm and egg fusion.

3. A.

In cleavage cytoplasmic volume does not change. But the volume of zygote cytoplasm is divided into increasingly smaller cells.

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