The newly fertilized ovum is called a :
embryo
foetus
conceptus
zygote
As a result of cleavage, the zygote becomes transformed into a hollow ball of cells called the:
mitosis
blastocyst
chorion
ectoderm
Fertilization actually takes place in which female reproductive structure?
Ovaries
Oviduct
Uterus
Vagina
Sex cells (sperm and ova) are called:
alleles
genes
gametes
zygotes
An absolutely essential growth process that begins within a few hours of fertilization and is a division of cells into identical cells is called:
embriosis
endotosis
reproduction
What is puberty?
Partitioning of replicated chromosomes into two identical groups.
Prenatal development of the organs of the fetus.
Adults undergo the process of sexual maturation.
Reproductive cycle in the female primates.
The principle that describes development as starting with the head and brain areas and moving downward is called:
cephalocaudal development
proximodistal development
teratology development
progressive development
How do gametes differ from other cells in the body?
Contain no chromatids
Contain one half the number of chromosomes that other cells have.
Contain twice the number of genes that other cells have.
Contain thrice the number of genes that other cells have.
The prenatal development of the organs of the fetus assume their specialized functions during the :
germinal stage
embryonic stage
fetal stage
critical stage
About what percent of zygotes die shortly after fertilization?
10 percent
23 percent
33 percent
43 percent
