Want to find out more inheritance modes?
Good day ,
I don't understand where other inheritance modes are possible.
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You have assumed that it will be inherited recessively. Although above it says that it will be inherited gonosomal-recessively, which is also true.
Genotype of 2 cannot be Aa, the man has no second plant, he has only one X with the defective plant.
In case of family tree analyses, one always checks whether it is dominant, recessive, etc.
Incorrect possibilities can be excluded, although this is often not quite possible with such short stem trees.
But the first generation must be heterozygous so that the recessive feature in the descendants can be pronounced ? Or not?
If it were a recessive inheritance, this would be so, but: the defect Rgb is on the X chromosome, men have only one X chromosome (XY).
Read here:
https://www.biologie-schule.de/stammbaumanalyse.php
Handwrittenly, “only men are affected” is so for the shown family tree, but also women can be affected by the disease.