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Figure 28.1 Embryo in membranes: (A) embryo in uterus; (B) chorionic villi. Reference: Figure 28.1 In Figure 28.1, identify number 4.

Figure 28.1 Embryo in membranes: (A) embryo in uterus; (B) chorionic villi. Reference: Figure 28.1 In Figure 28.1, identify number 3.

Figure 28.2 Fetal cardiovascular anatomy. Reference: Figure 28.2 In Figure 28.2, identify number 14.

Figure 28.1 Embryo in membranes: (A) embryo in uterus; (B) chorionic villi. Reference: Figure 28.1 In Figure 28.1, identify number 10.

Whether an organism will be genetically male or female is determined by ________.

If the ovaries are removed in the first 6 weeks of pregnancy, the embryo will be aborted. If they are removed later in pregnancy, the pregnancy can go to a normal full term. Explain the difference.

The process of spermatogenesis and spermiogenesis begins with a ________ and ends with four ________.

The mechanism that keeps the testes cooler than the body’s core temperature is called descent of the testes.

Why is it possible for spermatogonia to be outside the blood–testis barrier, yet necessary for primary spermatocytes and later stages to be within the barrier, isolated from the blood?

Male infertility (sterility) refers to ________.