Showing posts with label Genetics. Show all posts
Showing posts with label Genetics. Show all posts

Wednesday, April 24, 2019

HAND CLASPING



Hand clasping is the superposition of each finger of one hand over the corresponding finger of the opposite hand. When clasping the hands, a person tends to interlace the fingers in one of two ways.

People who hold the fingers of the right hand above the left fingers are classified as phenotype R (right), while those who hold the fingers of the left hand above those of the right are phenotype L (left).

Although some people do not exhibit a preference for one type of hand clasping, most do. Once adopted, the method of hand clasping tends to be consistent throughout life. When an individual attempts to clasp the hands in the opposite configuration from the usual one, that person may feel a sense that something is out of the ordinary.

(Your humble blogger is a strong L).



Saturday, November 24, 2018

IF IDENTICAL TWINS MARRY IDENTICAL TWINS HOW GENETICALLY SIMILAR WOULD THEIR CHILDREN BE?


Identical twins Brittany and Briana Deane first met identical twins Josh and Jeremy Salyers last August at The Twins Day Festival in Ohio. A year later, the couples had their weddings, together, wearing the same wedding outfits, at this year's Twin Day Festival. Their weddings were documented for a TLC special called "Twins Marry Twins," scheduled to air in 2019.


When identical twins reproduce with identical twins the resulting children are genetically indistinguishable from full siblings.




DOUBLE COUSINS



Double first cousins arise when two siblings reproduce with another set of siblings and the resulting children are related to each other through both parents' families. Double first cousins share both sets of grandparents in common and have double the degree of consanguinity than ordinary first cousins. Genetically they are as related as half-siblings. Their coefficient of coancestry is 1/8th or 0.125. While double first cousins have the same coefficient of coancestry (1/8) as half-siblings, they do have higher chances of sharing BOTH alleles (1/16 vs. 0) and lower chances of sharing one allele (3/8 vs. 1/2) with each other than half-siblings.




When identical twins reproduce with siblings the resulting children are more related than half-siblings but less related than full siblings.




Children of double first cousins are double second cousins.