Which of the following is a source of genetic variation in a population? a differences due to a car accident. b differences due to a hairstyle choice. c differences due to inherited genes.

c Differences due to inherited genes.

Gene flow or gene migration is an important source of genetic variation. It is a movement or transfer of genes from one population to another.  It can take place between two populations of the same species through migration and is brought by reproduction and vertical gene transfer from parent to offspring.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.