Longitudinal Study - ANSWER studies a person or
group of people over an extended period of time
Cross-sectional Study - ANSWER compares
individuals of various ages at one point in time
Genome - ANSWER the set of complete instructions
for making an organism
Chromosome - ANSWER the genetic master code for
the body. It is made up of DNA
DNA - ANSWER a complex molecule containing the
genetic information that makes up the chromosomes
, Identical Twins - ANSWER twins who develop from a
single fertilized egg that splits in two, creating two genetically identical
organisms
Fraternal Twins - ANSWER twins who develop from
separate fertilized eggs. They are genetically no closer than brothers or
sisters, but they share a fetal environment
Prenatal Period - ANSWER the period of pregnancy
that begins with conception and ends 9 months later with birth
Conception - ANSWER the fertilization of the egg
Zygote - ANSWER the fertilized egg
Differentiation - ANSWER cells choosing their
specialization, such as a stomach or a brain cell
Embryo - ANSWER the developing human organism
from 2 - 8 weeks (2nd month). At this time organs begin to form and
function (the heart beats, liver produces red cells, etc.), the umbilical
cord forms, and arms and legs are beginning to form
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