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Updated: June 2, 2025
Homozygous. Heterozygous. It must be explained that according to this theory the normal male is always heterozygous, because the Y chromosome never carries any other factor except that for sex; it is thus of no more importance than the absence of an X chromosome which occurs in those cases where the male has one sex-chromosome and the female two.
Rubricalyx is therefore a dominant heterozygote, and this fact was further confirmed in the third generation when a selfed plant gave 200 offspring all rubricalyx, the mother plant having evidently been homozygous for the red character.
This is the same difficulty which I pointed out above in connection with the Mendelian theory that the female was heterozygous and the male homozygous for sex. Dr.
This was supposed to support the view that the male is homozygous in sex, the female heterozygous in Vertebrates: that is to say, the female sex-character and the female secondary sex-characters are entirely wanting in the male.
BARRED female x unbarred male BX uY uX uX | \/ | | /\ | BX uX uY uX BARRED male unbarred female Heterozygous Homozygous BARRED male x unbarred female BX BX uX uY | \/ | | /\ | BX uX BX uY BARRED male BARRED female Heterozygous Heterozygous Another case is that of tortoise-shell, i.e. black and yellow cats.
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