37. Which of the following statement is true? A. It is only possible that an X chromosome of a woman is from her father, it is certain. Every woman has an X chromosome from her father and the other X chromosome from her mother. B. In men however the X chromosome comes always from his mother and the Y chromosome is always from his father C. Besides sex genes the sex chromosomes have also autosomal genes, genes that codify several proteins related only to sexual traits D. Diseases caused by abnormal number of sex chromosomes are called sex pseudoploidies 46. Which of the following barding utilizes fluarescent microSEope for microscopic analysis? A. Qbanding B. Rbanding C.G banding D.C banding

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.