In a Pp heterozygous organisms, one of the chromosomes carrying the P locus is moving towards
the pole at anaphase I of meiosis. In the absense of crossing overs, the P locus on this
chromosome is represented by _____ dsDNA molecules with genotype ______. (name every
complete allelic copy) (2, either PP or pp)
I have included the answers in the parenthesis after the question. Please explain how to get the
answers in details please :)
Solution
The organism is Pp. It will enter Meiosis I after completion of interphase. So, the genome will be
‘4n’, when entering Meiosis I, i.e. “PPpp”.
Crossing over will result in formation of “PpPp”. But there is no crossing- over in Prophase I.
So, “PPpp” will go into metaphase I and subsequently into Anaphase I.
At anaphase I, \'PP\' will go towards one end and \'pp\' will go towards another end.
So, genotypes of the two dsDNA molecules should be either \'PP\' or \'pp\'. Both will be
homozygous..
In a Pp heterozygous organisms, one of the chromosomes carrying the .pdf
1. In a Pp heterozygous organisms, one of the chromosomes carrying the P locus is moving towards
the pole at anaphase I of meiosis. In the absense of crossing overs, the P locus on this
chromosome is represented by _____ dsDNA molecules with genotype ______. (name every
complete allelic copy) (2, either PP or pp)
I have included the answers in the parenthesis after the question. Please explain how to get the
answers in details please :)
Solution
The organism is Pp. It will enter Meiosis I after completion of interphase. So, the genome will be
‘4n’, when entering Meiosis I, i.e. “PPpp”.
Crossing over will result in formation of “PpPp”. But there is no crossing- over in Prophase I.
So, “PPpp” will go into metaphase I and subsequently into Anaphase I.
At anaphase I, 'PP' will go towards one end and 'pp' will go towards another end.
So, genotypes of the two dsDNA molecules should be either 'PP' or 'pp'. Both will be
homozygous.
