Sexual Reproduction

Question 1

What are the two modes of cycles in females?

Answer 1

Spontaneous ovulation

Induced ovulation

Question 2

What is the biggest cue of timing of reproduction

Answer 2

Change in photoperiod - change in day length

Question 3

What are the three components of the HPG axis?

Answer 3

Hypothalamus
Pituitary gland
Gonad

Question 4

What receives the photoperiodic information from the eye?

Answer 4

The Suprachiasmatic Nucleus

Question 5

List the hormone cascade of the HPG axis, including what activates it

Answer 5

• Pineal Gland - melatonin
• Hypothalamus - GnRH
• Pituitary - FSH, LH
• Gonad - Testosterone, Estradiol

Question 6

What activates the HPG axis in induced ovulators?

Answer 6

Physical stimulation leads to norepinephrine release

Question 7

What hormone drives necrophilia?

Answer 7

Testosterone

Question 8

What are the two types of timing in reproduction? Briefly describe details

Answer 8

Rigidly linked - mating, fertilization, and embryonic development happen without interruption
Decoupled - Timing of the above aspects are done to match environmental, or other conditions

Question 9

What are the two tactics of decoupled reproduction?

Answer 9

Sperm storage

Embryonic diapause

Question 10

What are the two types of embryonic diapause?

Answer 10

Obligate and facultative