Composed of a phospholipid bilayer

The phospholipid bilayer builds the principle structural frame of the plasma membrane of the cell.

Explanation:

The plasma membrane of both plant and animal cell contain phospholipid bilayer in which the head group of the Phospholipid are oriented in opposite direction with respect to each other whereas the fatty acid tails of the two  layers faces each other each other in the phospholipid bilayer.

        The polar head group is present in the hydrophilic region whereas the non polar fatty acid tails are present in the hydrophobic region.

               Beside phospholipid  glycolipid,cholesterol and proteins are also present in the phospholipid bilayer.

                   Glycolipid contain oligosaccharide chain which play an important role in recognisation and binding of various molecules. Membrane proteins helps in the transport of various molecules in and out of the cell.whereas cholesterol regulates membrane fluidity.

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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.