Chromosomes, Chromatids, Chromatin

Q.

How long is your DNA?

Q. Number of Barr bodies present in a super female is

1. 1
2. 2
3. 3
4. 4

Q.

Write the rhyming words for the following words quick, all, see and may.

Q. Number of Barr Body is XXXX female:

1. 1
2. 3
3. 4
4. 2

Q.

The Noun Form Of Signify Is Significance True False

Q. Chromatin fibers condense to form distinct structures called .

1. chromosomes
2. centrosome
3. spindle fibres
4. centrioles

Q. If somatic cells of a human male contain a single Barr body, the genetic composition of the person would be

1. XXY
2. XXX
3. XO
4. XXXY

Q. Paragraph for below question
नीचे दिए गए प्रश्न के लिए अनुच्छेद

Fruit fly exhibits male heterogamety but all the insects do not follow similar pattern of sex determination. In case of honeybee, males have half the number of chromosomes than that of females. Male honeybees do not have father and cannot have sons too.

On the basis of above given informations, answer the following question.

फल मक्खी नर विषमयुग्मकता को दर्शाती है परंतु सभी कीट लिंग निर्धारण के समान प्रारूप का पालन नहीं करते हैं। मधुमक्खी की स्थिति में नर में गुणसूत्र की संख्या मादा की तुलना में आधी होती है। नर मधुमक्खी के पिता नहीं होते हैं तथा इनके पुत्र भी नहीं हो सकते।

दी गयी उपरोक्त जानकारी के आधार पर निम्नलिखित प्रश्न का उत्तर दीजिए।

Q. In honeybee, males develop from

प्रश्न - मधुमक्खी में नर किससे परिवर्धित होते हैं?

1. Diploid egg
   
   द्विगुणित अंड
2. Parthenogenesis
   
   अनिषेकजनन
3. Unfertilised sperm
   
   अनिषेचित शुक्राणु
4. Fertilisation of egg with sperm
   
   शुक्राणु के साथ अंड का निषेचन

Q. Post transcriptional modification of hnRNA

hnRNA का/के अनुलेखन पश्च रूपांतरण

1. Includes tailing at its 5′ end
   
   में इसके 5′ किनारे पर पुच्छन होता है
2. Occurs in cytoplasm of E. coli and in nucleus of yeast
   
   ई.कोलाई के कोशिकाद्रव्य तथा यीस्ट के केंद्रक में होता है
3. Includes addition of 5 methyl guanosine at 5′ end
   
   में 5′ किनारे पर 5 मेथिल ग्वानोसिन का संयोजन होता है
4. Is catalysed by RNA polymerase
   
   आरएनए (RNA) पॉलिमरेज द्वारा उत्प्रेरित होता है

Q. Read the following four statements (A-D)
(A) In transcription, adenine pairs with uracil.
(B) Regulation of lac operon by repressor is referred to as positive regulation.
(C) The human genome has approximately 50, 000 protein coding genes.
(D) Haemophilia is a sex-linked recessive disease.
How many of the above statements are right?

1. Three
2. One
3. Four
4. Two

Q. Number of Barr Body is XXXX female:

1. 1
2. 2
3. 3
4. 4

Q. What is chromatin ?

1. A defective gene
2. A replicated DNA
3. Entangled mass of thread like structures when DNA is not dividing
4. A mass of protein as a waste material

Q. Chromatin fibre is made up of DNA and ................

Q. Draw the structure of polytene chromosome and label the parts

Q. A single chromosomes consists of molecules of double stranded DNA.

1. two
2. eight
3. four
4. six

Q. Genetically active and rich in loosely packed DNA is?

1. Heterochromatin
2. Euchromatin
3. Both $1$ & $2$
4. Centromere

Q. The chromatin material which takes darker stain in interphase is called as

1. Euchromatin
2. Heterochromatin
3. Primary constriction
4. Satellite body

Q.
Deletions occur most often in chromosomal fragments

1. of polytene chromosomes
2. without centromeres
3. with centromeres
4. with inversions

Q. Which of the following statements regarding heterochromatin is correct.
Statement 1 - Heterochromatin is transcriptionally active.
Statement 2 - When stained it appears darker than the euchromatin.

1. Both statements are correct
2. Both statements are incorrect.
3. Statement 1 is correct but statement 2 is incorrect.
4. Statement 1 is incorrect but statement 2 is correct.

Q. Chromatin fibres condense to form

1. Centromere
2. Chromatin
3. Chromophores
4. Chromosomes

Q. Out of the two X chromosomes of the human female, one X chromosome is inactivated and heterochromatinized. The inactive X-chromosome can be seen as a darkly stained spot and is called as Barr body. Identify the number of Barr bodies that would be seen in the following genotypes.
46 XO, 46 XY, 46 XXY, 46 XXXY

1. 0, 1, 1, 2
2. 0, 0, 1, 2
3. 0, 1, 2, 3
4. 0, 0, 1, 1

Q. Heterochromatin remains condensed in which part of the chromosome?

1. Both (a) and (b)
2. Secondary construction I
   
3. Secondary construction II
4. Telomeres

Q. Chromatin fibers condense to form distinct structures called .

1. chromosomes
2. centrosome
3. spindle fibres
4. centrioles