Examlex
Sickle-shaped blood cells form because of interactions between cells.
Dominant Alleles
Dominant alleles are versions of genes that produce a dominant trait which will express itself in the phenotype, even when only one copy is present.
Monozygotic Twins
Identical twins that originate from a single fertilized egg, splitting and developing into two embryos.
Dizygotic Twins
Also known as fraternal twins, are two siblings born at the same time as a result of two different eggs being fertilized by two different sperm cells, sharing 50% of their DNA.
Zygote
The initial cell formed when a sperm fertilizes an egg, representing the earliest stage of embryonic development.
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