Genes can have different effects if they are from mothers or fathers {imprinting, development}|. Imprinting affects at least 75 human genes with imprinting centers, such as genes that make placenta and head. Mouse Nest gene is on X chromosome and causes maternal behavior: nest-building, retrieving babies, and cleaning babies. Imprinting silences mother's Nest gene. Father's Nest gene expresses.
cause
Fertilized egg cells need one male and one female pro-nucleus. Eggs with two male, or two female, pro-nuclei cannot live. CG-site methylation inactivates mother or father genes at imprinting centers. Imprinting ceases several days after conception, then sometimes recurs, and then finishes halfway through gestation.
gene types
Perhaps, father-imprinted genes make muscles, hypothalamus, amygdala, and preoptic region, and mother-imprinted genes make forebrain, cortex, striatum, and hippocampus.
Biological Sciences>Zoology>Development
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Date Modified: 2022.0224