M

Marker: A gene of known location on a chromosome and phenotype that is used as a point of reference in the mapping of other loci

Maternity: Related to pregnancy and birth

Megabase (Mb): Unit of length for DNA fragments equal to one million nucleotides

Midwifery: The techniques and practice of a midwife, a woman who is trained to assist women in childbirth

Mutation: Any inheritable change in DNA sequence