The ileum contains villi that project into the lumen and increase the amount of surface area.
Villi are small finger-like structures that project into the lumen of the small intestine. Villi increase the surface area of the intestinal walls for easy and quick absorption of digested food with the addition of digestive secretions. Villi vary in length from about 0.5 to 1 mm. They are usually found in large numbers at the beginning of the small intestine and they reduce toward the end of the tract.
Answer:
I think it is B. (brown eyes or not brown eyes)
In animal cells, cytokinesis begins with a pinching inward of the cell membrane midway between the cell's two poles. This cleavage furrow separates the dividing cell into two cells. In plant cells, vesicles formed by the Golgi apparatus fuse at the midline of the dividing cell, forming a cell plate. The cell plate will eventually separate the cell into two new cells.
E melts, it will cause a rise in sea level, which will affect and perhaps destroy ecosystems on coast lines. Changes in temperatures will also cause shifts in mating cycles, especially f
Answer:
2. The gene responsible for eye color is on the X chromosome.
Explanation:
<em>For X-linked genes, a male can either be affected or unaffected because the Y chromosome is hypothesized not to carry any gene. Females on the other hand can be a carrier, affected or unaffected because the two sex chromosomes carry genes.</em>
If eye color allele in drosophilia is represented by R, the cross between F1 red-eyed heterozygous female and red-eyed males can be illustrated below:
Red-eyed heterozygous female = ![X^RX^r](https://tex.z-dn.net/?f=X%5ERX%5Er)
Red-eyed male = ![X^RY](https://tex.z-dn.net/?f=X%5ERY)
x ![X^RY](https://tex.z-dn.net/?f=X%5ERY)
Progeny: ![X^RX^R, X^RY, X^RX^r, X^rY](https://tex.z-dn.net/?f=X%5ERX%5ER%2C%20X%5ERY%2C%20X%5ERX%5Er%2C%20X%5ErY)
Out of the 2 male progeny from the cross, 1 (
) is white-eyed while the remaining one (
) is red-eyed
Hence, the result shows that the gene for eye color in Drosophilia is X-linked.
Option 2 is the correct answer.