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WorksheetsFertilization & Twinning: A Review
Total questions: 18
Worksheet time: 9mins
Identical twins are formed by the fusion of ____ sperm and ___ egg(s).
one; one
one; two
two; one
two; two
The single-celled organism that that results from the fusion of a sperm and an egg is called a ________.
ovum
zygote
fertilyte
placenta
Identical twins, triplets, or quadruplets are all ________, meaning they resulted from a single sperm and egg that formed a zygote....that then SPLIT!
dizygotic
trizygotic
monozygotic
quadrizygotic
Fraternal twins are also known as _______ twins.
identical
non-identical
The twins in this image share 100% of their DNA. These are ___________ twins.
identical
fraternal
The twins in this image are ________.
identical
fraternal.
All identical twins are the same biological sex (two females or two males).
True
False
Fraternal twins are always the same biological sex (two females or two males).
True
False
The structure labeled A in this image is the _________.
chorion
amnion
placenta
umbilical cord
The structure labeled B in this image is the _________.
chorion
amnion
placenta
umbilical cord
The twins in this image are ________________.
monochorionic monoamniotic ("Mo/Mo")
monochorionic diamniotic ("Mo/Di")
dichorionic diamniotic ("Di/Di")
The twins in this image are ________________.
monochorionic monoamniotic ("Mo/Mo")
monochorionic diamniotic ("Mo/Di")
dichorionic diamniotic ("Di/Di")
The twins in this image are ________________.
monochorionic monoamniotic ("Mo/Mo")
monochorionic diamniotic ("Mo/Di")
dichorionic diamniotic ("Di/Di")
Which is more common, identical or non-identical (fraternal) twins?
Identical
Fraternal
Amniotic fluid has the function of _____________.
providing fresh oxygen and nutrients to the growing baby
cushioning the baby to prevent injury
connecting the baby to the placenta
all of the above
What are the sex chromosomes of a genetic male?
XX
XY
YY
What are the sex chromosomes of a genetic female?
XX
XY
YY
Fraternal twins share _____ of their DNA.
0%
50%
100%
