Answer:
A.........................
Answer AND Explanation:
<u>FACTORS THAT CAUSE GENETIC VARIATIONS</u>
- Crossing over. At the chiasmata during prophase I of meiosis, breakage may occur and exchange of genetic information may take place. New gene combinations which result in variations.
- Independent assortment. The arrangement of homologous chromosomes at the equator of the spindle during metaphase of the first meiotic division is random. These homologous chromosomes segregate into different daughter cells which contain different genetic combinations which brings about variation
- Fertilisation permits parental genes to be brought together in different combinations. This is the cause of variations in members of the same family.
- Mutation is the spontaneous change in the genetic makeup of an organism. These changes may be inherited by the offspring therefore beginning variation.
Examining tumor tissue for driver mutations can help plan treatments that stop cancer cells from growing.
tumors was EGFR, followed by TP53 (18%), SETD2 (11%) and SMARCA4 (11%). More than 72% (81/112) of cases have mutations in at least one driver gene.
For example, the TP53 tumor suppressor gene is a driver gene, but it is only functional when both alleles of her TP53 gene are mutated. Furthermore, mutations can act as drivers only at certain stages of cancer.
learn more about cancer here. brainly.com/question/11710623
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SSRI stands for S<span>elective Serotonin Reuptake Inhibitor and it is a type of antidepressant medication. These medications are used to treat depression, and have fewer side effects than other medications.
</span><span>These group of drugs works primarily by interfering with the reabsorption of serotonin in the brain. Serotonin is linked to happiness and good feeling, so i</span><span>ncreased serotonin can help relieve depression. </span>