Study of P elements in Drosophila has shown that gene regulation can be accomplished by differential mRNA transcript processing. Explain
What will be an ideal response?
The P element carries a single gene that encodes for the protein transposase. This protein is required for the transposition of P elements. The P element pre-mRNA is processed (spliced) differently in normal flies than in flies undergoing hybrid dysgenesis. In the former, the mRNA transcript is larger because the third intron is not spliced. But this results in a smaller protein due to the presence of an in-frame stop codon in the retained intron. In the germline of flies undergoing hybrid dysgenesis, all the introns are spliced out. This results in a smaller transcript that encodes for a functional transposase. This may result in transposition of the P element
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a. plasmid b. chromosome c. nucleus d. double helix
The cardiac, pyloric, anal, and ileocecal sphincters are all part of the
a. digestive tract. b. respiratory tract. c. circulatory system. d. muscular system.
In reference to diseases, the naturak host or primary habitat of a pathogen is referred to as its ______
Fill in the blank(s) with the appropriate word(s).
The site of gravity reception in roots is the:a
root apical meristem. b. periderm. c. root epidermis. d. root cap. e. root hair.