Answer: Gene that arose through gene duplication, but by acquiring mutations became nonfunctional.
Explanation:
A gene is a functional unit of heredity formed by DNA. They possess a sequence of nitrogenous bases that during translation is read by ribosomes to produce molecules called proteins. A pseudogene is a DNA sequence that resembles a gene, but which has been inactivated in the course of evolution by mutations in its sequence. Thus, it is a gene that derives from other known genes and whose functions are different, <u>may have lost their functionality or have radically changed </u>it. To this day, it is not known exactly how pseudogenes are created, however some theories are as follows:
1. A gene duplication can generate two copies of a gene when only one is needed. A mutation would then occur that deactivates one of the copies. In addition, the duplication event may not be complete, so that the copy has incomplete promoters.
2. They may be fragments of the messenger RNA transcript of a gene may be spontaneously reverse transcribed and inserted into the chromosomal DNA. They lack the promoters of normal genes, so they are not expressed normally.
3. A gene may become non-functional or inactivated if such a mutation becomes fixed in the population. This can occur by normal means such as natural selection or genetic drift.
Answer:
Type B+ can only receive blood from a donor that has blood type B and AB with Rhesus positive or negative.
Explanation:
The blood group system classification is based on the presence or the absence of antigens on the surface of the red blood cells. thus the blood group system is divided into four main blood group types/antigens present. During blood transfusion, the donated blood must be compatible with the patient blood type.
In blood transfusion, patient who is Rh positive can receive blood from donor who is Rh negative, but those with negative blood types cannot receive from anyone with a positive blood type but only the Rh- blood.
Donors with blood type A can donate blood to recipients with blood types A and AB
Donors with blood type B can give blood to recipients with blood types B and AB
Donors with blood type AB can donate to recipients with blood type AB only
Donors with blood type O can give blood to recipients with all blood types A, B, AB and O.
Answer:
Comparative anatomy is the study of the similarities and differences in the structures of different species. Similar body parts may be homologies or analogies. Both provide evidence for evolution. ... The structures are similar because they evolved to do the same job, not because they were inherited from a common ancestor.
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