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Also called great-nephew / great-niece. [21] A half-niece or half-nephew is the child of one's half-sibling, related by 12.5%. [22] [23] In some cultures and family traditions, it is common to refer to cousins with one or more removals to a newer generation using some form of the word niece or nephew. For more information see cousin.
It follows that for first cousin progeny, F = 0.0625, that is, 1/16 loci predictably are homozygous, whereas for second cousins, F = 0.0156, that is, 1/64 of loci are homozygous. [ 25 ] A 1990 study conducted in South India found that the incidence of malformations was slightly higher in uncle-niece progeny (9.34%) compared to the first cousin ...
A cousin is a relative that is the child of a parent's sibling; this is more specifically referred to as a first cousin.. More generally, in the kinship system used in the English-speaking world, a cousin is a type of relationship in which relatives are two or more generations away from their most recent common ancestor.
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The extent to which the risk increases depends on the degree of genetic relationship between the parents; so the risk is greater in mating relationships where the parents are close relatives, but for relationships between more distant relatives, such as second cousins, the risk is lower (although still greater than the general population).
Data on cousin marriage in the United States are sparse. It was estimated in 1960 that 0.2% of all marriages between Roman Catholics were between first or second cousins, but no more recent nationwide studies have been performed. [175] It is unknown what proportion of that number were first cousins, which is the group facing marriage bans.
The first prohibited degree of consanguinity was a parent-child relationship while a second degree would be a sibling relationship. A third degree would be an uncle/aunt with a niece/nephew while fourth degree was between first cousins. [ 4 ]