The genotype of the unknown individual is 
.
Males receive their X chromosomes from their mother.
They are not equally segregated among the male and female offsprings.
<h3><u>Explanation:</u></h3>
20. In case of the 1st pedigree problem, we can see that the male parent has the genotype of 
. And the female offspring has the genotype of . If the female gets the 
from her father, then 
has to be from the mother.
Now in the male offspring, the offspring gets the from mother, because males get the X chromosome from their mothers. So the mother has the genotype of .
21. The males have the genetic setup of 44 +XY. They get the 44 chromosomes equally from both the parents - 22 from father and 22 from mother. And as the mother has only X chromosomes as the allosomes, then the offspring gets Y chromosome from their father and X chromosome from their mother.
22. In the autosomal characters, the males have both pairs of functional chromosomes, so the relationship of dominant and recessive acts very well. But in case of the allosomes, they have only X chromosomes as the functional one, Y chromosome doesn't have any functional gene. So the gene which is present in X chromosomes, whether dominant or recessive, gets expressed in males. But in females, there are two X chromosomes, so the dominant and recessive characteristics gets reflected there. So in case of presence of one recessive allele, they becomes carriers.
I am not sure if you mean carbon dioxide instead of oxygen, since plants take in carbon dioxide from the air and, together with water, convert it into oxygen and sugar. The process is called photosynthesis. There is however also a reaction whereoxygen is used from the air in order to make sugar.
Answer:
B. DNA replication determines which genes are active
Explanation:
DNA replication is important in all organisms to stop the meiosis and mitosis from killing the cells. If DNA replication is done, the process can be stopped from occurring. The DNA doubles itself to quantify the cells splitting during the mitosis or meiosis. The DNA replication is similar to RNA transcription.
Answer:
Biomolecules. Biomolecules are all biological materials exclusive of cells and structural proteins when they are used as the “natural biomaterials” themselves. Biomolecules include proteins, lipids, etc., and can serve various functions like providing structural integrity to the tissue-engineered constructs.
Explanation:
False. It's not always reliable. For example, in lab mice, saccharin has caused tumors. But for humans to get cancer from saccharin, we would have to take in astronomical levels of saccharin, which we, as humans, don't do.
