Which of the following accurately describes the patterns of inheritance in human blood types?

The choices seem to be as follows:

a. Two alleles code for blood types and four phenotypes are possible.
b. Allele IA and IB are codominant, and allele i is recessive.
c. Allele i is dominant over alleles IA and IB.
D. Three alleles code for blood types and three phenotypes are possible. 

The answer to the question "Which of the following accurately describes the patterns of inheritance in human blood types" is A. Two alleles code for blood types and four phenotypes are possible. 

Interacting group of various species in a common location. for example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes a biological community.

Essential for a scientist to do for credibility

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.