Hemophilia is caused by a defect in the genes responsible for the formation of blood clotting factors viii and ix. These genes are located on the X chromosome. A female has two X chromosomes and a male has an X chromosome and a Y chromosome. Therefore, all the daughters of a hemophiliac father will be the carriers of this disease, and half of his sons acquiring the X chromosome from the father will have the disease.
I could be wrong but I’m pretty sure 1
So if your hypothesis is incorrect you can test to get the conclusion you want
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Answer:
a. All of these
Explanation:
<em>The characteristic of skin that makes it unpleasant for most bacteria would be due to all of the conditions.</em>
Most bacteria require humid condition in order to grow and as such, the desiccated nature of the normal human skin makes it difficult for them to establish themselves and grow on it.
The pH of the skin is usually acidic due to the production of lactic acid during sweating and the activities of the normal skin bacteria. The acidic pH hinders the growth of bacteria that can potentially become pathogenic to the skin.
Also, the skin produce antimicrobial substances at low pH which hinders the growth of pathogenic bacteria.
Hence, options b, c, and d are correct.