Unit
4
Life cycle
Biology Vocab
Express
The process in which
cells of a multicellular
organism become
specialized
Entire life span of an
organism; summary of all of
the stages of an organism
1
Differentiation
Male sex hormone
associated with male
sexual development and
reproduction
4
Testosterone
Haploid (1N) cell that
participates in fertilization
by fusing with another
haploid cell
13
Unit 4 Vocabulary
Development
Train Game
“Answer Key”
Locomotive → 1 → 4 →
13 → 22 → 25 → 99 → 5
→ 11 → 101 → 105 → 85
→ 50 → 7 → 100 → 999
→ 89 → 500 → 498 → 333
→ 27 → 37 → Caboose
Gamete
Reproduction that
involves two parents and
produces genetically
different offspring
Sexual reproduction
22
Zygote
25
Process during cell
division in which the
nucleus divides into two
99
Fertilized egg cell
Mitosis
Female sex hormone that
controls the development of
secondary sex characteristics
and the reproductive process
5
Process during cell
division in which the
nucleus of a cell
completes two
successive divisions that
produces 4 new haploid
gametes
Testes
11
50
85
Reproduction that involves
only one parent and
produces genetically
identical offspring
105
Early stage in the
development of plants
and animals; term for a
developing human during
the first 8 weeks of
pregnancy
Gamete-producing
organs of the male
reproductive system
Asexual reproduction
Embryo
Clone
Estrogen
Organism produced by
asexual reproduction that is
genetically identical to parent
101
Hollow, muscular organ
of the female
reproductive system in
which the embryo and
fetus develops
Uterus
Earth’s
Tilt
89
Organ through which the
mother nourishes an
embryo or fetus
100
Gestation period
Fertilization
999
Period of human
development; pregnancy
7
The process by which
haploid (1N) gametes
join to form a diploid (2N)
zygote
Menstrual cycle
Meiosis
Series of hormoneinduced changes that
prepare the uterine lining
for a possible pregnancy
each month
Ovulation
500
37
27
Developing human from 8
weeks until birth
333
Discharge of blood and
discarded uterine tissue
during the menstrual
cycle
The release of an egg
from a follicle in the
ovary
Fetus
Menstruation
Ovary
Placenta
Reproductive structure that
produces eggs
498