The term BIVALENT means…….
a) four chromatids
b) two chromatids
c) two chromosomes
d) four chromosomes
Generally the chromatids of each chromosome are attached with each other at a point known as……..
a) chiasmata
b) primary constriction
c) centromere
d) both b and c
Explanation: so each chromosome shows two arms ( region from centromere to an end)
Some chromosomes may have another point of union other than centromere, which is known as………
a) nucleolar organizer
b) secondary constriction
c) secondary centromere
d) both a and b
Which of the following give rise to nucleoli during interphase?
a) nucleolar organizer
b) centromere
c) chiasmata
d) both a and b
Explanation: at least one pair of homologous chromosomes possesses nucleolar organizer region
Beside secondary constriction, the end of chromosome becomes a knob like structure called………
a) telomere
b) satellite
c) centromere
d) ribosome
Explanation: this region has useless DNA sequence called junk DNA
The terminal end of the chromosome is called………which prevent the two chromosomes to attach with each other from their ends
a) telomere
b) satellite
c) centromere
d) ribosome
Explanation: A telomere is a region of repetitive DNA sequences at the end of a chromosome. Telomeres protect the ends of chromosomes from becoming frayed or tangled.
