Les
for plants and other organisms to develop differences among their respective species the alleles of their genes must contain
variations. what is the original source of these variations?
mutation
crossing over
random fertilization
independent assortment
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genetic information in cells
(sb2.b) genetic variations
id: 422854

The source of variations is mutation.

Option (a);

EXPLANATION:

Mutation can create a completely different allele of species and this means that the new version of genes will be created with the mutation. Genetic variation refers to the difference in genes within a population.

An organism's DNA  decides how that particular species looks or behaves. With the help of mutation, DNA of that organism is affected, thereby creating a different species altogether.

It is an important source of evolution as it affects the way that the body develops or works.

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explanation:

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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.