Chapter 36, Problem 16A

Summary Introduction

Introduction:

The Sequence of development is the process through which a baby is developed and finally takes birth. Early development is the first week of the human development period. Many developmental changes occur at this period as the zygote travels through the oviduct.

Answer to Problem 16A

Correct answer:

The correct answer is option (C) zygote, morula, blastocyst

Explanation of Solution

Explanation/justification for the correct answer:

Option (C) zygote, morula, blastocyst. This is the correct sequence of human development. With the fertilization of the egg by sperm creating the first cell that is the zygote, the first week of human life starts. The division of cells contributes to a ball of cells, the morula. The blastocyst is formed by more cell break and cavity forming in the cell core. So, this is the correct option.

Explanation for incorrect answer: 

Option (A) zygote, blastocyst, morula. The first week in human development undergoes the sequence of fertilization of egg and then creating zygote and cell division occurs leading to morula and then forming a blastocyst. So, this is an incorrect option.

Option (B) morula, zygote, blastocyst. This is not the correct sequence as, during the first week, the egg fertilizes first. So, this is an incorrect answer.

Option (D) morula, blastocyst, zygote. Morula occurs after formation of eggs and zygote. So, this is an incorrect option.