Answer:
C) The mouse CFTR gene and human CFTR gene encode proteins that can serve a similar function.
Explanation:
CFTR gene encodes for Cystic fibrosis transmembrane conductance regulator protein. It is ion channel protein and conducts chloride ions across the cell membrane. Its mutation leads to cystic fibrosis which is characterised by presence of thickened mucus in lungs with frequent infections.
In the given experiment, human CFTR gene is able to function in mouse and restore the lost body functions. This is because human and mouse CFTR gene show high level of similarity due to which they code similar proteins which can function in each other's place. However this does not mean that DNA sequence of the genes is identical. There is still some difference between them because they are two different species.
In reality human CFTR gene is around 189 kb in length whereas mouse CFTR gene is around 152 kb in length. The 27 exons have very similar sequence. Most introns of human CFTR gene are larger than the mouse counterpart.
1. a quantity of water: Liter
2. the length of a leaf: Meter
3. the mass of a small stone: Gram
Answer:
2) disruptive selection
Explanation:
Disruptive selection is a type of natural selection that acts against less fit heterozygotes. The disruptive selection can be represented by a decrease in the variance of a trait. In this case, the disruptive selection eliminates the medium-sized beaks, thereby favoring the extreme phenotypes in an interbreeding population.
Sensory neurons
Process
Light falls onto retina. The retina generates an impulse that is carried to the brain by the sensory neurons. An impulse is not carried by blood vessels, so that crosses out A. A muscle cant carry impulses either. Spinal cord isnt the answer because it doesnt have to go through the spine because the eye and brain is so close together
Endoskeleton
A. Insects and crustaceans
B. Fish
C. Insects especially the pollinators
D. All vertebrates <span />
