During DNA replication,
a. DNA polymerase is blocked by methyl groups, and methylated regions of the genome are therefore left uncopied.
b. methylation of the DNA is maintained because DNA polymerase directly incorporates methylated nucleotides into the new strand opposite any methylated nucleotides in the template.
c. methylation of the DNA is maintained because methylation enzymes act at DNA sites where one strand is already methylated and thus correctly methylates daughter strands after replication.
d. all methylation of the DNA is lost at the first round of replication.
e. methylated DNA is copied in the cytoplasm, and unmethylated DNA in the nucleus.
What would happen if you had a mutation that prevented the inclusion of exon 2 in the tra protein of Drosophila?
a. Genetic females would become males, and genetic males would become females.
b. Genetic males would become females.
c. Genetic females would become intersex flies.
d. Genetic females would become males. e. Genetic males would become intersex flies.

For the first part, the correct option is C

"methylation of the DNA is maintained because methylation enzymes act at DNA sites where one strand is already methylated and thus correctly methylates daughter strands after replication."

DNA methylation is an important process that maintains which genes will be 'on' or 'off'. Generally the methylated DNA regions are turns off the gene as it blocks transcription. One example of DNA methylation is the inactivation of the X-chromosome in females.

For the second part, the correct option is D

"Genetic females would become males."

The exon 2 region in transformer (tra) protein is found only in female flies and so will have no effect on male flies. It is responsible for somatic sex determination in female flies. A mutation in this protein would result in a male fly who is sterile, that is, one who cannot reproduce.

Hope that answers the question, have a great day!

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

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