Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. What is Barr body Genes?
Located inside nuclear envelope, it's a densely staining object which is an inactivated X chromosome in female mammalian cells. Most Barr body genes aren't expressed. They are reactivated in gonadal cells that undergo meiosis to form gametes. Female mammals are a mosaic of two different types of cells, those with an active maternal X and those with an active paternal X. Which of the two Xs will be inactivated is concluded randomly in embryonic cells. After an X is inactivated, all mitotic descendants will have same inactive X. As a consequence, if a female is heterozygous for a sex-linked trait, about half of her cells will express one allele and the other cells well express alternate allele. Illustrations of this type of mosaicism are coloration in calico cats and normal sweat gland development in humans. A woman who is heterozygous for this trait has patches of skin and patches of skin lacking sweat glands. X chromosome inactivation is related with DNA methylation. Methyl groups (-CH3) attach to cytosine, one of DNA's nitrogenous bases. Barr bodies are highly methylated compared to actively transcribed DNA. What determines which of two X chromosomes would be methylated? - A newly discovered gene, XIST is active only on the Barr body. Product of the XIST gene, X-inactive specific transcript, is an RNA; multiple copies of XIST attach to X chromosome inactivating it.
Define Essential Parts of Photocolorimeter - Sample Cuvettes? For accurate and precise reading, cuvette must be transparent, clean, devoid of any scratches and there should be
Define Determinants of Food Security - Food Utilization? It is the proper biological use of food, requiring a diet providing sufficient energy and essential nutrients, potable
Oxygen concentration When oxygen is abundant, the rate of oxidation is independent of oxygen concentration, but at very low oxygen concentration, the rate is approximately prop
Excretion in Non-Chordates Excretion as described under Introduction of this unit refers to removal of the waste products of metabolism - carbon dioxide (CO 2 ) and water rele
what arachnid is beneficial
How has the position of the stomata changed in some plants to prevent excessive water loss by transpiration? In some plants that have leaves that be given too much sunlight the
You have two enzymes, 1 and 2. Both convert substance A into substance B. 1 is inhibited by B, because B partially blocks the active site and will not allow more A to enter. 2 is i
Determine the posterior superior alveolar nerves The anterior, middle and posterior superior alveolar nerves run in the facial wall of the maxillary sinus between its lining me
What is the binding between two amino acids called? The chemical bond among two amino acids is called a peptide bond. Protein Structure Review - Image Diversity: peptide bo
Reproductive Organs In several metazoans, gonads are well-defined. Testes and ovaries take up dissimilar shapes and anatomical dispositions. In cases of certain hermaphrodites
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd