D. an inherited variation
Answer:
C. When the chest volume expands, air can now rush in through the puncture without filling the alveoli.
Explanation:
During inhalation, the contraction of the diaphragm and the external intercostals increase the volume of the chest cavity. As the chest cavity expands, the alveolar pressure become lower than the atmospheric pressure resulting in the flow of air into the lungs in response to the pressure gradient.
The chest cavity is an airtight chamber. This ensures that any changes in the volume of are chest cavity corresponds to the volume of the lungs. If a lung is punctured, the air would not fill the punctured lung but would escape through the hole. Therefore, the punctured lung would not be filled with air during inhalation.
Answer:
The horizontal or “X” axis runs perpendicular to the bottom of the graph itself and from left to right. The vertical or “Y” axis runs through the middle and runs straight up and down.
Explanation:
Answer: the so called Alternative splicing, or differential splicing, is a regulated process during gene expression that results in a single gene coding for multiple and many proteins. In this process, minimal parts of a gene may be included within or excluded from the final, processed RNA (mRNA) which is the messenger that produced that gene. In this way, the proteins that are translated from spliced mRNAs will contain differences in their amino acid sequence and also, in their biological functions. Furthermore, this process called alternative splicing allows the human genome to direct the synthesis of many more proteins as well.
Explanation:
Answer:
A. the heterozygote advantage
Explanation:
Heterozygote advantage is the condition where the heterozygous individual has higher relative fitness than both homozygous dominant and homozygous recessive individual. This means that the heterozygote individual has higher chances of surviving than both the homozygous counterparts. Sickle cell anemia is a recessive inherited disorder in which oxygen carrying hemoglobin has an abnormal structure. Hence, the resultant RBCs are not spherical but have crescent sickle shape. The oxygen carrying capacity of such RBCs is drastically reduced but they are unaffected by malarial parasite due to their abnormal structure.
- A person with both the recessive genes for sickle cell would not be able to survive due to insufficient oxygen transport in body.
- A person with both the dominant genes would be free of sickle cell anemia but in case of malaria would not be able to survive as the normal RBCs would be hijacked by the parasite.
- A hetrerozygote would survive both in malaria and sickle cell condition since he has enough normal RBCs for oxygen transport but also has sickle cell RBCs which are unaffected by malarial parasite.