For exercises 7 through 16. Use the following terms to complete the sentences or
statements.
fertilization
pregnancy
zygote
multizygotic
placenta
chorion
lunar month
fraternal twins
identical twins
growth
monozygotic
7.
_______________________ originate from the same ovum and are always of the
same sex.
8.
An increase in size is known as _______________________.
9.
The ___________________ is the outer membrane of the two fetal membranes.
10.
The _______________________ is a fleshy disklike organ.
11.
The combined ovum and sperm. _______________________.
12.
A sequence of events that normally includes fertilization, implantation, embryonic
growth, and fetal growth that terminates in birth. _______________________.
13.
The joining together of the ovum and sperm cells is referred to as ____________.
14.
A period of four weeks (28 days). _______________________
15.
The result of pregnancies involving two or more fetuses is known as
_______________________ and _______________________.
16.
Twins from two separate ova and sperm and may be of different sexes.
_______________________
2-19
MD0921