Identify four functions of invertebrate neurohormones and describe the regulation of insect development.

My college Bio teacher asked me this question in response to one of my photos I posted on Facebook: "I wonder why some birds exhibit sexual dimorphism while others do not." Can someone explain this phenomenom in detail?

Explain the wingless and hedgehog feedback mechanism that is used to pattern the fly embryo.

Select the two different ways that chemicals that might cause problems with sexual development and reproduction work - Estrogen mimics disrupt the endocrine system by attaching to molecules that except the hormone estrogen - estrogen prevents testosterone from developing. - hormone blockers keep certain hormones from attaching to their receptors. - hormone blockers help certain hormones attach to their receptors.

Chlamydia is a common STI. If left untreated it can cause infertility in females because: Select one: a. The infection damages the fallopian tubes and uterus b. The infection prevents release of GnRH c. The infection damages the testes d. The infection causes ear infections

The process which prevents a zygote from forming is known by what term?

REFE 1. Insect larvae, such as caterpillars or maggots, grow by shedding their skin in a process called moulting. When an insect larva moults, it can either become a larger, new larva or it can turn into a pupa. This process is controlled by hormones, one of which is called juvenile hormone or JH. High levels of JH cause the larva to become an even bigger larva wher moults. When the amount of JH falls below a certain level, the larva turns Into a pupa. (a) What would happen to the larva shown in the picture if the level of JH always stays high? (b) What effect would this have on the number of this species of insect in a particular area? A particularly annoying group of insects feeds on stored grain such as rice. The adults lay their eggs on the rice grains and the larvae eat the rice. Unfortunately, these insects are becoming increasingly resistant to insecticides. Research scientists are now beginning to look at a group of chemicals which resemble JH as a means of controlling these…

Table 16.5 What is the function of leptin?What tissue releases it? What is the function of ANP? What organ releases it What is the function of the thymus What is the function of estrogen? What is the function of testosterone? What is the function of FSH and LH on the testes and ovaries? What hormone released from the Hypothalamus stimulates the release of FSH and LH

What is the expected effect on reproduction on an individual with hormone levels shown in this graph. Identify two physiological changes that will not occur due to the atypical hormone levels shown above.

Does the distribution of Ca21 in an egg correlatewith formation of the fertilization envelope?