Down syndrome is caused by trisomy 21, the presence of three copies of chromosome 21. The extra copy usually results from nondis
junction during meiosis.In some cases, however, the extra copy results from a translocation of most of chromosome 21 onto chromosome 14. A person who has had such a translocation in his or her gamete-producing cells is a carrier of familial Down syndrome. The carrier is normal because he or she still has two copies of all the essential genes on chromosome 21, despite the translocation. However, the same may not be true for the carrier’s offspring.
Answer: The carrier’s offspring would suffer Down syndrome due to the presence of XXY chromosome.
Explanation:
Down syndrome is a condition caused by a chromosomal excess e.g XXY instead of XX-chromosome found in normal females or XY-chromosomes found in normal males
Translocation is the transfer of a chromosomal segment to a new position, especially on a nonhomologous chromosome.
After translocation, the carrier is normal because he or she still has two copies of all the essential genes on chromosome 21. However, on production of sex gametes, the transferred segment follows Mendel law of segregation and makes it way as XXY to the newly formed zygote - putting the carrier offspring at risk of Down syndrome.
A bacteriophage is an infection that attacks bacteria. At the point when the tail strands identify an objective host the bacteriophage to the cell, injected its DNA, and utilizations the microscopic organisms' apparatus to reproduce.<em></em>
<em>T4 is a sort of bacteriophage that infects of E. coli. </em>
The bacteriophage T4 capsid is a prolonged icosahedron,120 nm long and 86 nm wide, and is worked with three essential proteins such as gp23*, which shapes the hexagonal capsid cross section, <em>gp24*, </em>which structures pentamers at eleven of the twelve vertices.
<em>gp20, </em>which frames the extraordinary dodecameric entry vertex through which DNA.
T4 DNA Ligase is ligation catalyst which utilized the parts of DNA by the catalyzing between <em>compared 5'phosphate and 3' hydroxyl ends</em> and phosphodiester bonds in the double stranded DNA utilizing ATP as a coenzyme.
