Exam 42: Animal Reproduction

In most ant colonies, females are diploid, but males are haploid and develop from unfertilized eggs.This mode of asexual reproduction is more advantageous than regeneration when

Which feature characterizes secretions of the prostate gland?

Release of gametes to the aquatic environment is called

In which animals is external fertilization relatively common?

Birth control pills containing synthetic estrogen and progesterone inhibit the ovarian cycle.A similar situation occurs during pregnancy, when levels of estrogen and progesterone are high.During pregnancy, progesterone is produced first by the _______ and then by the _______.

Refer to the figure showing a sea urchin sperm and egg. Suppose the sperm is from a different species than the egg.Will the sperm be attracted to the egg, and what will happen if it contacts the jelly of the egg? Explain your answer.

Suppose three female sharks are housed without males in a large tank for many years.One morning the caretakers find a single pup swimming with one of the females.They test the pup's DNA and find that it is the same as that of the adult female.The pup likely resulted from

Refer to the figure showing the male reproductive tract. A man who is having trouble conceiving a child consults a fertility clinic and is told that he has prostatitis.It is a low-grade infection, but it appears to be causing less alkaline semen and is likely the cause of his infertility.The physician points to the structure(s) labeled _______ to indicate where the infection is located.

In honeybees, males are produced from unfertilized eggs and are haploid.This mode of asexual reproduction has advantages over budding or regeneration because

Which statement about testosterone is true?

In mammals, sperm-binding molecules are located in the

An infertile couple has come into a clinic to determine what form of assisted reproductive technique would be the best for them to try.The physician examining them determines that the woman has functional ovaries and her oviducts are not blocked.The man's sperm count, however, is low.The physician explains that under these circumstances, the simplest procedure to try is _______, which will allow the sperm a shorter trip to get to an ovulated egg.

A tumor in a Leydig cell would most directly affect the

The ovaries produce estrogen and progesterone.How might removal of the ovaries influence sexual behavior of female parthenogenetic whiptail lizards? What would you predict about their behavior if you then gave these females injections of either estrogen or progesterone?

Tay-Sachs disease is an autosomal recessive genetic disorder that causes deterioration of nerves during the early months of life and usually death by the age of 4 years.A man and woman who are both carriers of the Tay-Sachs allele want to have a child that is unaffected by the disease.To assure this outcome, their best approach would be to use _______ combined with genetic analysis of the embryos, which are two assisted reproductive technologies available in medical clinics.

In humans, fertilization typically occurs in the

Refer to the figure showing male reproductive hormones. In analyzing a 16-year old male patient with delayed puberty, it is found that the patient has low levels of serum LH, FSH and testosterone.Based on the figure, it is likely that the source of the problem is

Which event triggers the acrosomal reaction in mammals?

Which statement about germ cells in humans is true?

Which statement about fertilization is true?