Biology
Biology
10th Edition
ISBN: 9780073383071
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 19, Problem 1U

During development, cells become

a. differentiated before they become determined.

b. determined before they become differentiated.

c. determined by the loss of genetic material.

d. differentiated by the loss of genetic material.

Expert Solution & Answer
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Summary Introduction

Introduction:

When an undifferentiated cell divides, it doesn’t differentiate immediately. It decides its fate before following the decision. This decision making is termed as determination. A determined cell differentiates into the cell it was determined to be.

Answer to Problem 1U

Correct answer:

A cell always determines before differentiating into a specific cell. Therefore, option b. is correct.

Explanation of Solution

Reason for the correct statement:

A cell can’t commit to a particular differentiation as soon as it divides. It first determines its fate, then it commits to be a particular cell. Moreover, a determined cell might change its fate and differentiate into a different cell type positional signaling.

Option b. is given as “determined before they become differentiated”.

As “during development, cells become determined before they become differentiated”, it is the right answer.

Hence, option b. is correct.

Reasons for the incorrect statements:

Option a. is given as “differentiated before they become determined”.

Cells first determine then differentiate not the other way around. So, it is a wrong answer.

Option c. is given as “determined by the loss of genetic material”.

The genetic loss can’t help in the determination and development of a cell. So, it is a wrong answer.

Option d. is given as “differentiated by the loss of genetic material”.

The genetic loss can’t help in the differentiation and development of a cell. So, it is a wrong answer.

Hence, options a., c., and d. are incorrect.

Conclusion

A cell first determines than differentiates during the course of development.

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Which of the following defines fate?   A. process of which a potency of a cell becomes identical.   B. sum of all structures a determined cell's descendants will form at later stage of development.   C. A variety of structures that the descendants of a cells can potentially form.   D. a shift in the cortical cytoplasm of a zygote   E. none of the above
The expression of homeotic genes leads to a. the establishment of body axes. b. the formation of segments in the embryo. c. the determination of structures within segments. d. cell differentiation.
What a cell or tissue will normally develop into during development A. Cell Fate B. Competence C. Determination D. PotencyE. Specification
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Cell Differentiation | Genetics | Biology | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=gwAz_BtVuLA;License: Standard YouTube License, CC-BY