Since the gene is always present as a pair of alleles, with one inherited from each parent, two alleles are always present.
Feb 23 News Archive — Latest research covered Mon - Fri, archived weekly Synchronised waves control embryo patterning Scientists capture the affect of Wnt and Notch signalling pathways on developing embryos
During copying a segment of DNA may be deleted or a new segment may be inserted.
Mar 28 News Archive — Latest research covered Mon - Fri, archived weekly Stress during pregnancy affects size of baby Stress early or late in pregnancy causes fetus to entirely reprogram along different growth patterns
All monochorionic twins are MZ.
This may remain a scientific mystery.
Babies Twins identical twins.
Ideas about determination, or tendency, or capacity have little meaning for describing the relations between genotype and phenotype.
It means that EACH has a chance of inheriting the disorder or of being a carrier.
New algorithm uncovers timing of cell networks
A cell with an extra copy of a chromosome is a trisomy, a cell with a missing copy of that chromosome is an example of monosomy.
Regulatory proteins are proteins themselves the product of genes that control the expression of other genes and thus tie the whole genetic system together.
Feb 7 — Latest news in developmental biology covered Monday through Friday Getting Cells Going On a cellular level, physical contact also transfers energy across cell membrane
Jude's Research discovers a fourth gene that predisposes a carrier to the most common childhood cancer
Mar 19 — Latest news in developmental biology covered Monday through Friday Steps Closer to Curing Spina Bifida Exosomes secreted by stem cells carry molecules that protect neurons and reduce spinal cord injury of spina bifida
The insulin gene provides a template for insulin, the hemoglobin genes give templates for building hemoglobin, and so forth.