The correct answer is:
It occurs when part of a chromosome breaks off and attaches to another chromosome.
It results in the duplication of these genes on the same chromosome.
Fragile X syndrome can occur where a person would have 700 insertion repeats.
Difficulties include delay in crawling or walking, hyperactive or impulsive behavior, mental retrdation, flat feet, flexible joints, and large body size.
Hope it helps!
I have absolutely no clue<3
Answer:
Option-D
Explanation:
Casparian strips are the strips or band composed of a hydrophobic substance called the suberin which forms the ring-like structure in the endodermis of the vascular plants.
The Casparian strips are present around the vascular bundles in the endodermis to allow the uptake of the selective nutrients as the substance has to pass through the cell membrane before it enters the centre of the root or stele or vascular bundles.
The Casparian strips allow the movement of a substance through symplast mode only, therefore, is ensures the substance to pass through the cell membrane.
Thus, Option-D is correct.
C. Chromosomes because they are need to have the cell funtion.
