1) let the alleles be P-purple, W- white
purple * violet
PP * PW
|P||PP ( purple)||PW( violet)|
|P||PP ( purple)||PW ( violet)|
the phenotypic ratio is purple: violet=1:1
so the answer is e) 1:1 purple violet
2) DNA replication starts at origin of replication, DNA melts at the origin of replication, from a single origin of replication, DNA replication proceeds in both directions, the bacterial chromosome has only one origin of replication, but eukaryotic linear chromosomes has multiple origins of replications.
DNA replication occurs during S phase of the cell cycle.
so the answer is b) In eukaryotes, each linear chromosome contains a single replication origin sequence, which is activated during the G2 phase of the cell cycle.
3) The genotype of males is XY and females is XX, the SRY gene located on the Y chromosome is responsible for the development of male sex organs.
e) The presence of a Y chromosome, which carries the male determining SRY gene
4) let the alleles be Xv- vermillion, XV- wildtype.
the genotype of a male fly with normal eyes is XVY and genotype of a female fly that has vermillion eyes is XvXv.
XvXv * XVY
|Xv||XVXv ( female with normal eyes)||XvY ( male with vermillion eyes)|
|Xv||XVXv ( female with normal eyes)||XvY( male with vermillion eyes)|
none of the female progenies have vermillion eyes.
percentage of the F1 females will have vermillion eyes is c) 0%.
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