Answer:
This disorder is caused by a recessive allele, its inheritance is sex-linked.
Explanation:
The disorder affects boys born to unaffected parents, this means that at least one of them has to be a carrier of the allele which causes the disease. So, if the allele was dominant, it would express in parents and sons. But, in this case, only is expressed in sons, so it can´t be dominant. Moreover, this condition has a sex-linked inheritance because it is always seen in boys and never in girls. This happens due to boys only have an X chromosome, so if they inherit the recessive allele of the disease, they will express it. On the other hand, girls have two X chromosomes, so if they inherit one copy of the recessive allele, they will be carriers and they won't be affected.
This disorder is never seen in females because they need to have two copies of the recessive allele. However, to have double copy, they should inherit one copy from their mothers and one copy of their fathers, but boys with the allele are affected and they die in early teens without having progeny. Therefore, a girl can't have a "carrier-father", so they will never have two copies to express the disorder.
The appropriate response is Vegetative growth. It is the second stage in the life of a plant after it finishes germination and starts photosynthesis. Amid this stage, a plant will be photosynthesizing however much as could be expected to develop as fast as it can before the onset of the blooming stage.
<em>The members of a society B. Belong to the same species and interact closely witheach other.</em>
How continents shift position on Earth's surface.<span>Set forth in 1912 by Alfred Wegener, a geophysicist and meteorologist, continental drift also explained why look-alike animal and plant fossils, and similar rock formations, are found on different continents. </span>
Based on the diathesis-stress model schizophrenia is the result of interaction between environmental and biological/genetic factors. According to this model, when the combination of the predisposition (diathesis) and the stress (biological, social, and psychological stressors) exceeds a threshold, the person will develop a disorder.
