Hello, I need to determine the inheritance type of this family tree in biology, but I'm stuck. Is it autosomal?
the text is in English because I have the class in English, just ignore it please
(2 votes)
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Hello,
it is autosomal-dominant because:
violet: noticeable parents have featureless children. This is proof of dominance. Unfortunately, you have to write it everywhere until it contradicts itself and so try if you don’t have the constellations in your head that prove such a thing. In 2 seconds, you can see that it is dominant, so it is worth remembering. If it were recessive, parents would have genotype “aa” and could not have healthy children. So dipping healthy children, it is dominant.
Since now dominant is known, one can try to determine autosomal or gonosomal. There are also constellations that immediately reveal what it is when they occur in the family tree. Red: If a sick father (17) has a healthy daughter (21) in a dominant inheritance, it is proven autosomal. Because if it were gonosomal, he would inherit his daughter’s “sick” x-chromosome, which would lead to a disease in dominant inheritance. Because she’s not sick, it can’t be gonosomal. You have to get it out here by writing the genotypes.
Moin,
You’re right…
The Red-Green-Red-Colourblindness (Green-Red-Colourblindness) is recovered x-chromosomal (x-linked recessive trait).
Accordingly, in affected parents (Father 8 – x*Y – and Mother 9 – x*x*) all children (both sex) must also be affected, i.e. also persons 15 and 16. This seems to be a mistake in the given family tree.
According to the indication, however, the brownness is predominantly inherited x-chromosomal (x-linked dominant trait). The thing looks different because here a dominant allele is sufficient to cause brownness, so that even heterozygous persons are brownish, but they can inherit both brown eyes and non-brown eyes.
But nowadays it is known that the eye color does not follow a simple dominant-recessive inheritance. The thing is more complicated (polygenic inheritance).
However, if you have meant that the woman would have to be 13 red-green-blind if the red-green-seal weakness x-chromosomal would be predominantly inherited, then you are also right here, because the affected father 3 must have a dominant X*, so that all daughters (also person 13) would also have to be affected.
But here the indication in the text is correct: the red-green weakness is inherited x-chromosomal recessively. The non-affected persons 15 and 16 are errors in the representation…
LG from the Waterkant