Explanation:
In the majority of cases, the extra copy of chromosome 21 comes from the mother in the egg.
In a small percentage (less than 5%) of cases, the extra copy of chromosome 21 comes from the father through the sperm.
In the remaining cases, the error occurs after fertilization, as the embryo grows.
Answer: they may be mysteriously related.....
Explanation:
Answer:
b. false
Explanation:
Old world monkey and new world monkey do not have same dental formula . Dental formula is different for old world monkey as compare to new world monkey.
Old world monkey have 2.1.2.3 dental formula but on the other hand new world monkey have 2.1.3.3 dental formula .
Old world monkey have narrow nose but new world money have wide nose.Generally old world monkey are found in Asia and Africa that is why they called old world monkey.
Answer:
The correct answer is option D. Light and some other factors are necessary for chlorophyll production
Explanation:
By this experiment, it is clear that light is the major factor that helps in the production of chlorophyll in seedlings or plants. In this study, placing the seeds in the light turns 75 seedlings green which is possible by the production of the green pigment, chlorophyll only. So, it is proved that light is a key factor in the production of chlorophyll.
Besides light, there must be some other factors (mineral nutrition and chemical metabolites) that also play role in the production of chlorophyll or increase or decrease of the chlorophyll production as few seedlings did not turn green in the study.
