Why is it necessary to have six co2 entering the chloroplast?

In order to produce the 6-carbon glucose molecule and regenerate RUBP.

Explanation:

Plants undergo two stages in photosynthesis, one which is the light dependent reaction is used to produce ATP and NADPH needed for the next stage, which is the light independent stage or C3 or Calvin cycle.

In the Calvin cycle, Carbon is fixed when CO2, which enters via the stomata is accepted by Ribulosephosphate (RUBP) to produce an unstable 6-car-on compound which disintegrates into 3-phosphoglycerate (PGA). The PGA undergoes reduction and phosphorylation by ATP and NADPH to produce Glyceraldehyde-3-phosphate (G3P). The G-3-P either continues the cycle in order to regenerate RUBP or leaves the cycle to produce glucose.

CO2 can only be fixed one at a time. Since G-3-P is a 3-carbon compound, it takes 3 molecules of CO2 to enter the cycle in order to produce 1 G3P molecule that will leave the cycle i.e 3 molecules of CO2 enters the cycle to produce 6 molecules of G3P, one molecule leaves the cell and 5 molecules are used to regenerate RUBP.

Hence, since, glucose is a 6-carbon compound, 2 molecules of 3-carbon G3P will be required. To get 2 molecules of G3P that will leave the cycle to produce glucose, 6 molecules of CO2 will need to be fixed in the stroma of the CHLOROPLAST.

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.