Risteytys kaavio ja lapsen perimä

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Liittynyt3.9.2015

Koulun biologian tunnilla puhuttiin risteytys kaaviosta. Siinä selitettiin äidin ja isän perimää lapselle. Eli miten sen risteytys kaavion pohjalta voimme päätellä saako lapsi esim. ruskeat vai siniset silmät ja kuinka suurella mahdollisuudella. Voisko joku selitää, miten yleensä päätellään kuinka suurella todennäköisyydellä lapsi saa siniset tai ruskeat silmät jos vanhempien oma perintä tiedetään.

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Vierailija

Silmien värin periytyminen on polygeneettinen. Ainakin kolmen eri värin koodaavaa geeniä tunnetaan -sini/vihreä (gey) - ruskea/sininen (bey2) - ruskea (bey1)

Phenotypes and Genotypes for human eye colors

Part of the study of genetics involves being able to predict the appearance (phenotype) and genetics (genotype) of the offspring of animals or people. Sometimes this is just for fun, such as breeding dogs to get a certain color, but sometimes it is very serious, as when dealing with diseases that can be passed from parents to their children. Here is an example of what we know about the genetics of eye color.

There are three known human eye color genes named: EYCL1 (gey), the Green/blue eye color gene, located on chromosome 19. EYCL2 (bey1), the central brown eye color gene, possibly located on chromosome 15. EYCL3 (bey2), the Brown/blue eye color gene located on chromosome 15. A role has also been suggested for the Melanocortin Receptor Gene (MCIR) on chromosome 16. A second gene for green has also been postulated. Other eye colors including black, grey, and hazel are not yet explained. We do not yet know what these genes make (except MCIR), or how they produce eye colors. The two gene model (EYCL1 and EYCL3) used here clearly does not explain more than a portion of human eye color inheritance.

Two gene model: There are two genes involved in eye color. One gene has Dominant Brown or recessive blue states, the other has Dominant Green or recessive blue states. We further assume that Brown in the first gene will swamp out Green or blue from the second gene, and Green from the second gene will swamp out blue from the first gene. Because chromosomes come in duplicate pairs, each parent has two copies of each gene.

Interaktiivinen eye color calculator:

http://www.athro.com/evo/inherit.html

http://www.athro.com/evo/gen/eyecols.html

ja täältä, kuten linkki osuvasti -- mistupid.com --

Yksinkertainen Mendelin malli. (dominatti-resessiivinen)

http://www.mistupid.com/science/heredity.htm

http://www.tiede.fi/vanhakeskustelu/ket ... id=1369454

Gregor Mendel

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