Mitotic Cell Cycle ( Chapter 5 )

Question 1

HOW ARE CHROMOSOMES MADE?

Answer 1

The structure of chromosome is only visible during cell division.
In the nucleus we have the chromatin material present which is the thread like structure which condenses into chromosomes during cell division.

Question 2

WHAT ARE CHROMOSOMES MADE UP OF?

Answer 2

They are made out of DNA and protein. ( histone protein )

Question 3

STRUCTURE OF CHROMOSOMES

Answer 3

They have arm like structures called chromatids ( 2 chromatids)
The centre were they are all linked to is called the centromere.
Each chromatid contains one identical copy of DNA molecule, in which you will find the genes

Question 4

NUMBER OF CHROMOSOMES IN HUMANS

Answer 4

46 chromosome and 23 pairs

Question 5

HOW ARE LONG DNA MOLECULES FITTED INTO A CELL

Answer 5

The DNA could around 8 histone proteins. ( the DNA super coils)
The support coiling structure is called the nucleosome.

Question 6

HOW MANY TYPES OF CHROMOSOMES ARE THERE

Answer 6

2 types

Question 7

WHAT ARE THE TYPES OF CHROMOSOMES

Answer 7

1. Homologous chromosomes
2. Sex chromosome

Question 8

HOMOLOGOUS CHROMOSOME

Answer 8

Homo= same Logous= structure
In the first 22 pairs of chromosomes the structure of each pair is the same.

Question 9

SEX CHROMOSOME

Answer 9

In this the 23rd pair of chromosome is known as sex chromosome which determines the individuals sex

Question 10

WHAT CHROMOSOMES THE FENDER OF MALES AND FEMALES

Answer 10

Male: XY
Female: XX

Question 11

WHAT IS A LOCUS

Answer 11

Position of a gene on a chromosome