Question

all member of Gupta family can roll their tongue which of the part of nucleus is responsible for this characteristics​

Answer 1

Complete Question:

All member of the Gupta family can roll their tongue which part of the nucleus is responsible for this characteristic?

i. Nucleolus

ii. Chromatin network

iii. Nucleoplasm

iv. Endoplasmic reticulum

Answer:

ii. Chromatin network of the nucleus is responsible for this characteristic of all members of the Gupta family.

Explanation:

• The Chromatin network is made up of DNA and proteins embedded in the nucleoplasm.

• During the resting stage, the chromosomes are present form in uncoiled as a loose indistinct network called "Chromatin".

• The proteins are of either histone or non-histone types. Most of the chromatin thread in the non-dividing nucleus is coiled and wound into condensed masses called heterochromatin, which is found near the nuclear envelope.

• The uncondensed regions of chromatin, where the chromatin threads are largely dispersed into their fine macromolecular components are referred to as euchromatin.

• Chromocentres or false nucleoli are dark stained chromatin granules present along the twisted filaments of chromatin.  

• The genetic constitution of an organism is manifested phenotypically as observable traits such as earlobe attachment, rolling and folding of tongue and cerumen type.

• Genes are composed of two or more variates i.e. alternate forms, called alleles. Individuals may inherit two identical or two different alleles from their parents which may interact in a dominant and recessive manner.

• For example, the alleles for tongue rolling/folding are dominant over none rolling/none folding.  

• A gene that can be passed from a human parent to its offspring i.e. from one generation to the next is the tongue rolling gene.
• So, the genetic information is stored in DNA, which is a part of the chromatin network.

• As a genetic molecule, DNA can transmit genetic information from generation to generation owing to its capacity to self-replicate. DNA is present in the form of genes and is passed from one generation to another.

• The nucleolus acts as the site of synthesis of ribosomes. Thus it is incorrect.

• The endoplasmic reticulum produces steroids, and lipids and gives rigid support and structural network to the cell. Thus, it is incorrect.
• Nucleoplasm serves as the suspension substance for the organelles present inside the nucleus. Thus, it is incorrect.

Thus, the correct answer is ii. Chromatin network.

i.e. The genes present in the chromatin network are responsible for this rolling and folding of the tongue.  

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Answer 2

Answer:

 The correct answer to this question is Chromatin network of the nucleus is responsible for this characteristic of all members of the Gupta family.

Explanation:

• A chromatic may be defined as it is a genetic material that is composed of DNA and histone protein, which condense to form chromosomes during cell division. In all the eukaryotic cells, it is a mass of genetic material.
• This chromatin is less compact and by doing so it forms a structure which is known as euchromatin. The structure of chromatin resembles the arrangement of string on the beads when observed under the microscope. Each nucleosome has kardiya which is WAP with 8 histone proteins. The primary function of chromatin is to compress and PAG long DNA molecules into the small and dense structures.
  
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