Restriction enzyme cuts samples of DNA at restriction site; produces different lengths of DNA segments
D). Carcinogens are chemical factors in an organism's environment that can cause spontaneous mutation.
You are supposed to answer what happens in each phase of meiosis.
Answer:
A) A transgene integrated into a heterochromatic region of the genome.
Explanation:
This is most likely the reason why the transgene is not expressed in the fifth cell line. It is likely that the transgene was integrated into a heterochromatic region of the genome. Heterochromatin consists of genetically inactive satellite sequences, and many of these are repressed to various extents. Moreover, because this is a tightly packed form of DNA or condensed DNA, it is inaccesible to polymerases and thus not transcribed.
