Answer: Option (b) is the correct answer.
Explanation:
An atom which gains electrons becomes negatively charged and an atom that donates electrons become positively charged.
Therefore, when we rub a silver coin against a wool cloth then cloth becomes positively charged this means that the cloth has lost electrons and the silver coin has gained electrons.
Thus, we can conclude that the statement silver coin gained electrons is true.
The only group with an endoskeleton is A or D because you put the same answer choice twice
Answer:
Hemophilia
Explanation:
This is a disorder in which a blood coagulation factor is missing from the blood, so if the person with the disorder gets even a small injury, he'll bleed a lot due to absence of proper blood coagulation.
It's more common in males than females because females have two X chromosomes. If they have one recessive allelle on one X chromosome, while the other has the dominant allele, they're going to be asyptomatic carriers of the recessive allele.
However, since males have only one X chromosome, having the recessive allele means that they'll suffer from hemophilia. There's no chance of them being just carriers unlike the females.
Answer:
True.
Explanation:
Polygeny occurs in organisms with complex genomes, when several pairs of genes interact to determine a trait, each with an additive effect on the other. Thanks to this type of interaction there is a very wide variety of phenotypes and genotypes for some characteristics. The interaction of these phenotypes with the environment further increases this variation, such as skin color and height, etc. In other words, polygeny is the state of a particular trait determined by the relationship or action of various genes.
In human populations, ethnic hatred and civil war can cause two populations to become reproductively isolated as happened in Rwanda where the Tutsi and Huttus blamed each other for the problems of their nation and with the result of no friendly relation between the two and a resulting genocide.
