Answer:
Dissimilar organisms might have evolved from a distant, common ancestor.
Explanation:
First of all we should know species. Species is considered as a basic unit of taxonomic classification of an organism.
Initially, the scientists are agreed on this phenomenon that all distinct species are evolved gradually from common ancestor. Today, the species which are different from each other just like hummingbirds, humans and whales are from the same ancestor but with the time passage genetic mutation occurs and at the end dissimilar organisms we can see in our environment/surroundings.
Answer:
Genes on chromosomes
Explanation:
It has been conclusively established that chromosomes contain the hereditary material or factors that are transmitted from parent to offspring. These factors are called genes. A gene is a short portion of a DNA molecule and is chemical in nature. A gene codes for a specific protein by specifying the order in which the amino acids are linked together.
Answer:. Nondisjunction during meiosis I in either the male and female gamete
The failure of homologous chromosome to separate at mitosis, or failure of sister chromatids to separate at Anaphase of meiosis I or ii is called non-disjunction.
In this cell division anomaly the unsegregated chromosomes are separated into cells as single chromosomes, therefore extra copies are therefore inherited.This result is one of the cell having an extra copies of chromosomes than others( chromosomes 21.
If this extra chromosome copies is segregated into a sperm or egg, the resulting zygote cells will have extra copy as chromosome 21, and hence Down syndrome.
→It is more common in Meiosis 1 than ii,because of longer duration of the first stage of division than meiosis ii,given rooms to errors.
→Most common in women(with age increase) than men because of exchange of telomeres in them,which worsen with age. Their Meiotic mechanism which weaken with age, and more prone to errors compare to men,
Explanation:
1. Ask for the social security number (SSN).
2. Ask for valid IDs.
3. Ask for medical certificate/s.
4. Make reinforcing laws.
5. Cameras everywhere.
(1) Social security number is important to distinguish any American citizen from each other. (2) Valid IDs with the victim's address, date of birth, and clear photo can help to verify if the citizen is the victim. (3) Medical certificates will certify that the person in question was really afflicted by the accident. (4) What is the most fool-proof way to make sure the bill is foolwed? By making laws and regulations that will solidify if that is! (5) More cameras will both prevent the accident and make sure that the accident is well documented with evidence! Imagine diving in a road full of video cameras around; would you drive like a drunk? NO!
