The number of Barr bodies in female and male nucleus. Introduction: The first visualization of Barr body was by Murray Barr- 1949 . Barr body is a dense structure of chromatin, forms in the nuclei of female somatic cells. In humans, females have two X chromosomes and males have one X and one Y chromosomes. The sex cells or gamete cells are the only cells that take part in sexual reproduction while the remaining cells are called somatic cells that do not participate in the process. In females, one X chromosome is active while another X is inactivated through the process of lionization, and it becomes a Barr body. In order to have an equal amount of X chromosome expression in both males and females, X inactivation is necessary; otherwise the amount of genetic information expressed will be two fold or more. The selection of X chromosome to be inactivated is random, but once the active and inactive X chromosomes are selected, the descendent cells will have the same X chromosome active and inactive.

Question

Want to see the full answer?

Answer 1

Question

Chapter 3, Problem 10P

Summary Introduction

To analyze:

The number of Barr bodies in female and male nucleus.

Introduction:

The first visualization of Barr body was by Murray Barr-1949. Barr body is a dense structure of chromatin, forms in the nuclei of female somatic cells. In humans, females have two X chromosomes and males have one X and one Y chromosomes. The sex cells or gamete cells are the only cells that take part in sexual reproduction while the remaining cells are called somatic cells that do not participate in the process. In females, one X chromosome is active while another X is inactivated through the process of lionization, and it becomes a Barr body. In order to have an equal amount of X chromosome expression in both males and females, X inactivation is necessary; otherwise the amount of genetic information expressed will be two fold or more. The selection of X chromosome to be inactivated is random, but once the active and inactive X chromosomes are selected, the descendent cells will have the same X chromosome active and inactive.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

What are biofertilizers and mention the significance

PCBs and River Otters: Otters in Washington State’s Green-Duwamish River have high levels of polychlorinated biphenyls (PCBs) in their livers. PCBs can bind to the estrogen receptors in animals and disrupt the endocrine system of these otters. The PCBs seem to increase the estrogen to androgen ratio, skewing the ratio toward too much estrogen. How would increased estrogen affect the river otter population? Based on your reading of the materials in this unit, what factors can affect fertility in humans? Explain how each of the factors affecting human fertility that you described can disrupt the human endocrine system to affect reproduction.

Other than oil and alcohol, are there other liquids you could compare to water (that are liquid at room temperature)? How is water unique compared to these other liquids? What follow-up experiment would you like to do, and how would you relate it to your life?