- Question 20 Suppose A Researcher Has Three Different Drosophila Strains That Have Mutations In The Bicoid Gene Called Bi 1 (124.73 KiB) Viewed 304 times
QUESTION 20 Suppose a researcher has three different Drosophila strains that have mutations in the bicoid gene called bicoid-A, bicoid-B, and bicoid-C, the wild type is designated bicoid. To study these mutations, phenotypically normal female flies that are homozygous for the given bicold mutation were obtained, and their cocytes were analyzed using a Northern blot to determine the size and/or amount of the blooid mRNA and in situ hybridization to determine the bicoid mRNA location within the cocyte. A wild-type strain was also analyzed as a control. In both cases, the probe was complementary to the bicoid mRNA and the results are shown below. (Anterior is on the left; posterior is on the right) Northern blot 1 2 3 4 Lane 1. Wild type (bicoid) Lane 2. bicoid-A Lane 3. bicoid-B Lane 4. bicoid-c - In situ hybridization Wild type bicoid-A bicoid-B bicoid-c Which mutation is likely to cause the embryo to develop two anterior ends? O bicoid-A O bicoid-8 O bicoid-c QUESTION 21 Which of the following statements is false? The "TATA box' is a type of cis-regulatory element O A transcription factor only binds the cis-regulatory element that regulates its own expression One transcription factor can regulate genes located on different chromosomes The enhancer is a type of cis-regulatory element O Atranscription factor can have different activities depending on the other transcription factors and cofactors present