Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which of the following processes does not increase genetic diversity?

a. parthenogenesis

b. random DNA mutations

c. genetic recombination

d. independent assortment

e. random combinations of paternal and maternalchromosomes

Summary Introduction


Genetic variation occurs when two male and female parents with different genetic makeup reproduce sexually. These individuals originated as a result of sexual reproduction, acclimatize to the changing environment and undergo the process of changing the environment. The offspring produced have a mixture of genes from both parents.


Justification/explanation for the correct answer:

Option (a) is parthenogenesis. This is a form of asexual reproduction in which the female gives birth to the offspring without the contribution of the male. The female ovum divides by meiosis and without the sperm, an offspring is produced. This phenomenon is common in the lower organisms and does not result in viable mammals. The offspring is a clone of the female mother except in cases of aphids where the male has an XO (hemizygous) genotype. Hemizygotes have chromosomes as a single copy gene. Hence, option (a) is correct.

Explanation for the incorrect answers:

Option (b) is random DNA mutation. Mutation is a change in the genetic makeup of an individual that can occur because of chemical and physical changes. They can prove to be dangerous as well as fruitful to the individuals. They promote genetic variations, which pass on to future generations. So, it is an incorrect option.

Option (c) is genetic recombination...

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