Alleles for the A and B blood cell antigens are codominant. The condition where no antigens are present on the blood cells (type O blood) is a recessive trait. Which set of parents can most likely produce a child with
type O blood

This question lacks options, the options are:

A. one parent with type AB blood, and the other parent with type A blood

B. one parent with type AB blood and the other parent with type O blood

C. one parent with heterozygous type A blood, and the other parent with type O blood

D. one parent with homzygous type A blood, and the other parent with homzygous type B blood

The answer is C. One parent with heterozygous type A blood, and the other parent with type O blood

Explanation:

Blood type in humans is controlled by a gene with multiple alleles. The alleles for the A (iA) and B (iB) blood types are codominant but dominant over the O type (i). This means that an individual can only have blood O type if the genotype is (ii).

According to this question, the set of parents that can most likely produce a child with type O blood is: one parent with heterozygous type A (iAi) blood, and the other parent with type O (ii) blood. This is because the parent with type A blood will release gamete will "i" allele while the parent with type O will also release gamete will "i" allele, hence, an individual with ii (type O) forms.

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.