Chromosome And genes

Question 1

1 dna is approximately how long?

Answer 1

2m

Question 2

Nucleosomes

Answer 2

Hiistones with dna molecules wrapped around them

Question 3

…. does not transcribe any proteins and Gennes. Found very close to the ventromere and ends of the chromosome

Answer 3

Heterochromatin

Question 4

Difference between centromere and kinetochore

Answer 4

Centromere is constricted reason, kinetochere is protein complex arranged on centromere

Question 5

Four types of chromosomes on location of centromere in order

Answer 5

Metacentric
Submetacentric
Akrocentric
Telocentric

Question 6

Linked genes?

Answer 6

Gene’s found very close together on the locus of a chromosome

Question 7

How many groups of chromosomes are there depending on length and morphology

Answer 7

7 
a. 1 to 3
b. 4 to 5
c. 6 to 12
D. 13 to 15
E. 16 to 18
F. 19 and 20
G. 21 and 22
Sex chromosomes

Question 8

Look at slide 30

Answer 8

..

Question 9

Type of chromosome abnormalities

Answer 9

Translocation
Deletions
Duplication(practically translocation but w homologous chromosomes)
Inversion

Question 10

What is CpG methylating

Answer 10

Methylating the cytosine of a CphosphateGuanine motif to silence genes

Question 11

Chromosome size in interphase and metaphase

Answer 11

11-30 nm

300 to 700 nm

Question 12

Types of banding

Answer 12

Q banding - stained with a fluorescent dye such as quinacrine
G banding - staining with Giemsa after digesting the chromosomes with trypsin
R banding - produces the reverse of G band stain
C banding - chromosomes are treated with acid and base then stained with Giemsa

Remember UGRC but with a Q