Fraternal twins develop from two separate eggs that have been fertilized by two separate sperm.
Marmoset mothers almost always give birth to fraternal twins, which develop from two eggs and are thus genetically distinct.
Identical twins, who inherit identical genes, tend to be far more similar in their allergies than siblings or fraternal twins, who develop from two embryos, not one.
DZ twins develop from two separate eggs, fertilized by two separate sperm, and are in effect simply two siblings that happen to be born simultaneously.
In Litomatix truncatellus, which is parasitic on the larvae of the noctuid moth Plusia gamma, about 1,000 embryos develop from one egg.
The pollen grains of most plants produce only one pollen tube, but 10 or more pollen tubes have been observed to develop from one pollen grain in plants of the mallow family.
Dizygotic (or fraternal twins) means that they develop from two different eggs.
However, tissue sections are not informative in determining whether beta cells from a single islet develop from one or several progenitors.
Based on the expected genotypes shown in Table 1, it appears likely that these embryos have Ate1 Δ/f genotype, i.e., develop from one defective gamete affected by premeiotic Ate1 deletion and one normal floxed allele.
Dizygotic (DZ) twins develop from two zygotes and, like non-twin siblings, share on average 50% of their segregating genes.
DZ twins develop from two different oocytes but they are siblings and have a common genetic background and a much more common prenatal environment than unrelated pairs.
