Of the two functional areas of the years of age is known as ________. It blastocyst, the three primary germ is during this time that the reproductive layers form from the ________. organs grow to their adult size and

Correct Answer: D

Rationale: The correct answer is D: adulthood. The question is referring to the two functional areas of life - childhood and adulthood. During adulthood, organs grow to their adult size and mature, reproductive organs become functional under the influence of hormones. A: amnion become functional under the influence - Incorrect. Amnion is a membrane surrounding the embryo, not related to the functional areas of age. B: morula of hormones - Incorrect. Morula is an early stage of embryonic development, not related to the functional areas of age. C: inner cell mass - Incorrect. Inner cell mass is a part of the blastocyst, not related to the functional areas of age.

Correct Answer: B

Rationale: The correct answer is B. Primary spermatogonium undergo mitosis to replicate and maintain the diploid chromosome number, then meiosis to reduce the chromosome number, resulting in secondary spermatocytes. Choice A is incorrect as it skips meiosis. Choice C is incorrect as it suggests two meiotic divisions from primary spermatogonium, which is not accurate. Choice D is incorrect because it fails to mention the initial step of mitosis before meiosis in the process.

Correct Answer: A

Rationale: The correct answer is A: just after fertilization. After fertilization, the secondary oocyte completes its second meiotic division, forming a mature ovum and a polar body. This process occurs to ensure the correct chromosome number in the resulting zygote. Choices B, C, and D are incorrect because the completion of the second meiotic division occurs specifically after fertilization, not before or just after ovulation or fertilization.

Correct Answer: D

Rationale: The correct answer is D: 23. Sperm cells are haploid, meaning they contain half the number of chromosomes as normal body cells. In humans, normal body cells have 46 chromosomes (23 pairs), while sperm cells have only 23 chromosomes. This is essential for maintaining the correct chromosome number after fertilization. A: 1 - Incorrect. Sperm cells cannot have only 1 chromosome as they need to contribute genetic material during fertilization. B: 2 - Incorrect. Having only 2 chromosomes would not provide sufficient genetic diversity for offspring. C: 12 - Incorrect. This number does not align with the haploid nature of sperm cells in humans with 23 chromosomes.

Correct Answer: B

Rationale: The correct answer is B: ovulation. Ovulation is the process where the ovarian follicle ruptures and releases an ovum. This occurs around the middle of the menstrual cycle. Menopause (A) is the cessation of menstrual periods, not the release of an ovum. Implantation (C) is the attachment of a fertilized egg to the uterine wall, not the release of an ovum. Breast (D) is not related to the process of ovulation.