Question

Chapter 8: Cellular Reproduction: Cells from Cells Chapter Content: The Cell Cycle and Mitosis Complete the following questions as you read the chapter content-The Cell Cycle and Mitosis: 1. Inside the nucleus of a cell you will find DNA associated with proteins. This combination of protein and DNA is known as a. a centromere b. chromatin c. sister chromatids d. a gene 2. Use the figure below to answer this question: Which organism has over twice as many chromo- somes as a human? Species Number of chromosomes in body celis Indian muntjac deer Koala Opossum Giraffe Mouse Human Duck-billed platypus Bison Dog Red viscacha rat 102 38 Copyright © 2016 Pearson Education, Inc.

Answer 1

1. The answer is Chromatin

Chromatin - It is present in chromosomes. It consists of DNA and proteins (histone proteins ). Proteins are helpful in packaging DNA where DNA is genetic carrier. This proteins helps in giving compact structure to chromatin.

Centromeres are places in chromosomes . These has short and long arms. So this is wrong option.

Identical chromosomes attatched with each other by cohesins are called sister chromatids. These identical chromosomes together are called one chromosome. So this is also wrong option.

Genea has DNA which is responsible for traits of the organisms. This donot have proteins. So this is also wrong answer...

2. The answer is Red viscacha rat

Number of chromosomes in human body cell = 46

Twice number of chromosomes than human = 2×46= 92

So we have to see the animal which has chromosomes greater than 92 for having twice as many as chromosomes do humans have.

So , in the table only red viscacha rat has chromosomes greater than 92. It has 102 chromosomes.

So answer is red viscacha rat........