2015 Pearson Education, Inc. HOMEWORK Chapter 13 The following figure illustrate

Question

2015 Pearson Education, Inc. HOMEWORK Chapter 13 The following figure illustrates the genomic DNA of the dumpy gene in Drosophila melanogaster. The promoter region is 500bp long, exon 1 is 600bp long, intron 1 is 600bp long and exon 2 is 300bp long. 6 ' promoter Exon 1 Intron 1 Exon 2 +1 +600 /601 +1200/1201 1500 Initiation codon ATG (A is at n.t position +201) Stop codon TAG (G is at n.t. position +1403) 1. 2. 3. What is the length of the immature dumpy mRNA? What is the length of the mature dumpy mRNA? What is the length of the dumpy coding sequence? 2015 Pearson Education, Inc

Explanation / Answer

1. there is two exons one is 600 base pairs long and another is 300 base pair long. One intron is also here, which have length of 600 base pair.

Immature RNA contains both exons and introns. The total size of immature mRNa does not include promoter region. promoter do not undergo transcription.

2. Mature m RNA only have exons because introns are removed from immature mRNA and produce mature mRNA.

Exons= 600+300

= 900 bp what is the size of mature messenger RNA.

3. initiator codon is present plus at +210 positionn and stop codon is present on 1401position.

so lenth = 600-200 = 400( because going to 200 is the part of exam but not take part in the formation of protein).

In second exon = from 1200 to 1400 means of 200 base pairs.

so 400+200= 600.

So we can say that protein coding sequence is approx 600 base pairs.

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