Review. Spermatogenesis, Oogenesis, Crossing Over, Imprinting---A Review. Primary germ cells migrate from the yolk sac to the ovaries or testes where they undergo mitosis and become oogonium or spermatogonium or remain germ cells. Spermatogenesis.
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Primary germ cells migrate from the yolk sac to the ovaries or testes where they undergo mitosis and become oogonium or spermatogonium or remain germ cells.
1. When does this happen in the formation of the egg and sperm?
2. Show the gametes formed using the letters “A” and “B” and “a” and “b”.
Epigenetics and Disease:
Parent specific expression or repression of genes
or chromosomes in offspring.
So… even though two copies of a given gene are inherited,
one from each parent, only the maternal or paternal allele
The non-expressed allele is said to be “imprinted.”
Genomic imprinting and disease:
Several diseases are associated with genomic imprinting
Fragile X syndrome
Myotonic dystrophy (congenital)