Disjunction of mini-X chromosomes from X^Y

Paternal genotypesay2y+y By+ BNcNDJd
X^Y, y B/Dp118764661064757824810.493
X^Y, y B/Dp11872761962211708630.518
X^Y, y B/Dp1163476169350825960.437**
X^Y, y B/Dp1146269669541422670.380**
X^Y, y B/Dp1236348842329215660.414**
X^Y, y B/Dp1252959856637520680.434**
X^Y, y B/Dp6129438837123212850.406**
X^Y, y B/Dp611521781531005830.429**
X^Y, y B/Dp6248283475631723890.326**
X^Y, y B/Dp6261484778125024920.339**
  • a Males carrying the attached-XY chromosome YSX.YL, In(1)EN, y B (symbolized X^Y) and one copy of each of the indicated mini-X chromosomes were crossed singly with two females carrying the attached-X chromosome C(1)RM, y2 (symbolized X^X).

  • b Disjunction of the Dp from the X^Y results in X^X/Dp (y+) females and X^Y/O (y B) males. Dp-X^Y nondisjunction gives rise to X^X/O (y2) females and X^Y/Dp (y+ B) males.

  • c N, total progeny scored.

  • d NDJ = (y2 females + y+ B males − 0.5(1 − T)N)/NT. (Values of T are from Table 1). Asterisks indicate the level of significance of the χ2 test for the difference between observed NDJ and NDJ = 0.5. *P < 0.05; **P < 0.01.