The xylem is made from dead, hollow cells.
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Tracheids and vessel elements are the main components of xylem witch have a function to transport water. Those are elongated dead cells at maturity (without protoplast) with a thick, strengthened cellulose cell wall and a hollow lumen. Even though they are dead they still maintain a function, because are being protected by surrounding living cells.</span>
Answer:
Interphase 0.90 = 18 Hours
Prophase 0.04 = 48 Minutes
Pro-metaphase 0.02 = 24 Minutes
Metaphase 0.01 = 12 Minutes
Anaphase 0.02 = 24 Minutes
Telophase 0.01 = 12 Minutes
Admitting that the "a" is a capital A for normal pigmentation and "d" is a capital D for dimpled chin, meaning that these are the dominant traits, the fraction expected to be albino with a non-dimpled chin is of 1/16.
When two heterozygous are crossed and two characteristics are being analysed, the offspring quantity that will possess the two recessive traits can be represented by 1/16. This is easily confirmed when a Punnett square is made. Considering that both parents were heterozygous, on both sides of the crossing in the Punnett square, you would have the following alleles' combination: AD, Ad, aD, and ad. The offspring that would be homozygous recessive (aadd) would correspond to only 1/16.
Answer:
One Idea was the appreciation that the age of the Earth was much greater than had hitherto for been imagined.
