Cloning：练习题

What is a characteristic of plants produced through the process of micropropagation?

During the process of micropropagation, explants are grown in a nutrient medium. Why is it essential that this medium contains magnesium ions?

The diagram illustrates the stages involved in cloning a mammal, such as Dolly the sheep. Which of the following steps is necessary to ensure the offspring is genetically identical to the donor animal?

In the process of micropropagation, small pieces of plant tissue are grown in vitro to produce commercial quantities of plants. What is the correct term for these pieces of tissue?

In the production of cloned mammals, a diploid nucleus is inserted into an enucleated egg cell. What is the biological reason for using a diploid nucleus rather than a haploid one?

Why is it essential that the nutrient medium used in micropropagation is kept sterile?

What is the function of a surrogate mother in the process of cloning a mammal like Dolly the sheep?

During the cloning of a mammal, why is a small electric shock applied to the egg cell after the donor nucleus has been introduced?

Micropropagation is a technique used to produce large numbers of plants.
a) Define the term explant.
b) State two conditions that must be maintained in the agar medium to ensure successful growth of the explants.

The production of cloned mammals involves complex cellular manipulations.
a) Explain the difference between a haploid egg cell and the diploid nucleus used in cloning.
b) Describe the role of a surrogate mother in the process of cloning a mammal like Dolly the sheep.