Biology Questions and Answers
bladder, of the urethra and of the GI
tube (except of the mouth the alveolar cells of the lungs and theand anus), (^)
thyroid and parathyroid glands.
- What are twins?
Genetically what are the two
types of twins that can be
generated?
Twins are simultaneously g(within the mother’s uterus) oeneratedffspring. (^)
Twins classifymonozygotic or as dizygotic according to zy twins.gosity as
Monozygoticidentical twins, are those o twins, also known asriginate (^) d
from one single fertilized ovum
(therefore from one single zygote);monozygotic twins are genetically
identical, i.e., they have identical
genotypes asame sex. Dizynd are necessarilygotic twins, also k of thenown (^)
as fraternal twins, are those generated
from two dtwo different sperm cells; so thifferent ova fecundated byey are (^)
not geneticallynot necessarily identical of the same s and they areex.
- What is polyembryony?
Polyemwhich a sinbryony is the phenomenon ingle embryo in its initial
embryonic stage dmany new individuals oivides itself f the same sexforming (^)
and genetically identical. This is the
way, for example, in wtakes place in armadilloshich reproduction of the genus
Dasypus. Polyemof natural “cloning”.bryony is an example
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