Biology: Concepts and Investigations
Biology: Concepts and Investigations
5th Edition
ISBN: 9781260259049
Author: Hoefnagels
Publisher: MCG
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Chapter 11, Problem 9WIO
Summary Introduction

To determine:

The steps scientists might have used to clone extinct species of gastric brooding frog that swallows its eggs and broods its young within its stomach and to explain the importance of determination before the experiments that the great barred frog is a close relative to the gastric brooding frog.

Concept introduction:

A somatic cell is any cell in the body other than the two types of reproductive cells that are sperm and egg. Every somatic cell has two complete sets of chromosomes, whereas germ cells only have one complete set.

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The following diagram outlines how the process of cloning a sheep was accomplished. Cloning is the process of creating a genetically identical copy of another individual. With Dolly, the first cloned mammal, an egg cell was removed from a donor (B) and the nucleus was removed from the egg cell. Then cells from a sheep's mammary gland were removed from a second donor (A). The nucleus of one of the cells from the mammary gland was fused with the enucleated egg cell using an electrical pulse. The fused cell underwent cell division and at the blastocyst stage was implanted into a surrogate mother sheep.  The fused cell is cultured and is implanted as a multi-celled embryo. During the step where the fused cell begins dividing normally, the cells of the future clone undergo Select one: a. fertilization b. meiosis c. mitosis d. gene splicing
The following diagram outlines how the process of cloning a sheep was accomplished. Cloning is the process of creating a genetically identical copy of another individual. With Dolly, the first cloned mammal, an egg cell was removed from a donor (B) and the nucleus was removed from the egg cell. Then cells from a sheep's mammary gland were removed from a second donor (A). The nucleus of one of the cells from the mammary gland was fused with the enucleated egg cell using an electrical pulse. The fused cell underwent cell division and at the blastocyst stage was implanted into a surrogate mother sheep. The percentage of genetic material that Dolly (the clone) had in common with Donor A is  Select one: a. 25% b. 50% c. 100% d. 0%
Woolly mammoths have been extinct for about 10,000 years, but we often find their well- preserved remains in Siberian permafrost. Research groups are now planning to use SCNT to resurrect these huge elephant- like mammals. No mammoth eggs have been recovered so far, so elephant eggs would be used instead. An elephant would also be the surrogate mother for the resulting embryo. The researchers may try a modified SCNT technique used to clone a mouse that had been dead and frozen for sixteen years. Ice crystals that form during freezing break up cell membranes, so cells from the frozen mouse were in bad shape. Their DNA was transferred into donor mouse eggs, and cells from the resulting embryos were fused with mouse stem cells. Four healthy clones were born from the hybrid embryos. What are some of the pros and cons of cloning an extinct animal?

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Biology: Concepts and Investigations

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