How do genetic and environmental defects cause problems in development? 

Describe the process of internalization of mesoderm in frog. What are the end results of the gastrulation process? 

Chose the correct answer form alternatives provided.

a) Fertilization is responsible for the activation/arrest of development.

b) Activation of the sperm ensures/does not ensure that sperm will meet the egg.

c) In organisms with external/internal fertilization, chemotactic mechanisms have been evolved to attract the sperm towards the egg.

d) A period of maturation in the female reproductive tract required for the transformation of sperm is known as activation/capactiation.

e) Sperm using an enzyme called acrosin/hyaluronidase penetrate their way through zona pellucida.

Discuss the process of development of extra embryonic membranes in chick

Fill in the blanks:

i) The four types of mammalian uteri are ………………….., ………………………., …………….. and ……………………. .

ii) The muscle layer of the uterus is called ………………………….

iii) The sequence of organs of mammalian female genital system are: two ovaries …………..……… …………..…… ……………… …………….. .

iv) In female birds only the …………………… gonad develops into the 

Progesterone 

How is EMT used in the embryo and in the adult?