Reproduction and heredity：练习题

Which of the following describes the function of the placenta during pregnancy?

Which statement correctly describes the function of the amniotic fluid during the development of a fetus?

Which statement best explains why meiosis is essential for sexual reproduction in humans?

In human genetics, which term describes an individual who possesses two different alleles for a specific gene?

A genetic pedigree shows a condition appearing in every generation, where an affected parent always has at least one affected child. This inheritance pattern most likely represents a:

Explain the specific role of Follicle Stimulating Hormone (FSH) in the human female reproductive system during the first half of the menstrual cycle.

Identify two processes that occur during meiosis that lead to genetic variation in the resulting haploid gametes.

Define the term allele and explain how alleles contribute to the variation observed within the human species.

(a) State the names of the four hormones involved in the control of the human menstrual cycle and the organ that secretes each.
(b) Explain the role of Luteinising Hormone (LH) and Progesterone in the menstrual cycle.

(a) Compare the roles of oestrogen and testosterone in the development of secondary sexual characteristics during puberty.
(b) Explain the role of the umbilical cord in connecting the foetus to the placenta.