Question

please explain part d with drawing illustration as I do not understand it.

Father with losis 4). Suppose you have mouse lines that have three cytologically distinct forms of chromosome 20. Besides the normal chromosome 20, one version has a knob (20k) and another has a satellite (20s). (The small circle represents the centromere). is I of II 0 20 0 20k (Knob) no 20s (satellite) You cross a 20k 20s female with a 20 20 male. Most of the progeny are 20k 20 or 20s 20. However, some rare progeny are identified: Savara) 20k 20k 20 DR b) 20k 20s 20 meiosis1) c) 20k Father meiasis torm + not (Mother wubsis ) he happen ble there was no 20 at all d) 20 / 20k 20k 20 mosaic (a mixture of cells with 20 and cells with 20k 20k 20) NDJ in mitosis of 20k in a 20k/20 zygote Explain these exceptional types. Suggest at what stage or stages the error that produced them may have arisen and whether it occurred in the mother the father nr the ruante in all race ured

Answer 1

d ) one cell contains 20 and other cells contain 20k 20k 20.

Aneuploidy occur due to the failure of the disjunction in meiosis I ( most common ). When the chromosome unable to separate during anaphase .

During anaphase one cell contain 20 and the another cell contains 20k 20k 20.