Question

erythroblastosis fetalis occurs when the mother is rh_ and the child is rh_.

positive, positive
positive, negative
negative, positive
negative, negative

question 23 (2 points) saved
the main reason(s) for the different distributions of blood type abo alleles in the world is due to...

differential fertility
disease incidence
a and b
none of the above

question 24 (2 points) saved
the pathogen which targets helper t cells in order to reproduce and propagate is called...

influenza a
hiv
spanish flu
avian flu

Explanation:

Analyze Rh incompatibility conditions

Erythroblastosis fetalis is a hemolytic disease of the newborn. It occurs when maternal antibodies attack fetal red blood cells. This immune response is triggered by Rh Incompatibility. Specifically, it happens when an Rh-negative mother carries an Rh-positive fetus. The mother's immune system recognizes the fetal Rh antigen as foreign and produces anti-Rh antibodies.

Analyze ABO allele distribution factors

The global distribution of ABO Blood Groups alleles is shaped by multiple evolutionary forces. Natural selection plays a major role through both differential fertility (certain maternal-fetal combinations lead to incompatibility) and disease incidence (different blood types offer varying susceptibility or resistance to infectious diseases like malaria, cholera, and plague). Therefore, both factors contribute to the global distribution.

Identify helper T cell pathogen

Helper T cells express CD4 molecules on their surface. The Human Immunodeficiency Virus (HIV) specifically binds to CD4 receptors to gain entry, replicate, and propagate within these host immune cells, eventually destroying them. Other listed pathogens like Influenza A do not target helper T cells.

Answer:

Question 1

• positive, positive
• positive, negative
• negative, positive (Correct answer)
• negative, negative

Question 2

• differential fertility
• disease incidence
• A and B (Correct answer)
• none of the above

Question 3

• Influenza A
• HIV (Correct answer)
• Spanish flu
• Avian flu