What is the difference between first degree and second
degree relationship?
A First Degree Relative has at least
a ½ (50%) genetic link to a person.
Mother, Father, Daughter, Son, Full Sister - Includes heterozygous twin/ multiple birth, and Full Brother - Includes heterozygous twin/ multiple birth
A Second degree Relative has a ¼ (25%) genetic link to a person.
Grandmother, Grandfather, Granddaughter, Grandson, Aunt, Uncle, Niece, Nephew, Half sister, and Half brother.
Mother, Father, Daughter, Son, Full Sister - Includes heterozygous twin/ multiple birth, and Full Brother - Includes heterozygous twin/ multiple birth
A Second degree Relative has a ¼ (25%) genetic link to a person.
Grandmother, Grandfather, Granddaughter, Grandson, Aunt, Uncle, Niece, Nephew, Half sister, and Half brother.
The entire link is at:
http://wiki.answers.com/Q/What_is_the_difference_between_first_degree_and_second_degree_relationship
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