00:01
Hello student here the question is given and the question is about this non -disjunction.
00:06
So this non -disc junction is simply described when chromosome fail to separate during meiosis.
00:27
So we know this meiosis can be occurred in the two phases, the meiosis 1 and meiosis 2.
00:34
So in the case of meiosis 1, this is a type of reductional division.
00:39
So in this reductional division, the chromosome is going to be two deployed daughter cells.
00:48
So from here the two deployed daughter cells are formed and in this place also the crossing over takes place.
01:01
Crossing over only occur in this meiosis 1.
01:05
And if we talk about these meiosis 2, we know the meiosis 2 is a kind of equational division.
01:12
Mitosis.
01:13
So here these two is going to produce the four haploid daughter cells and in this case there is no crossing over taking place.
01:26
So here the question is which one is more serious whether these meiosis one or meiosis two.
01:32
So this meiosis one is more serious.
01:40
So we can say the meiosis one is more more serious non -dischunction than these meiosis 2 because this meiosis 1 is the as we earlier said this is the reductional division and in this case the chromosome number will be half so if their non -ditch junction takes place in only one gamut so in this case when non -disjunction takes place only one gamut and other gamut lack chromosome.
02:40
So this chromosome 2n minus 1 and this one having this 2n chromosome.
02:46
So in that case chromo gamut having chromosome after fertilization.
02:52
So this in this case after fertilization they are going to be trisomic condition...