What is the function of dispersed repeated sequences such as SINEs and LINEs in eukaryotes?
What will be an ideal response?
Little is known about the function of such sequences, but one hypothesis is that they have no function at all. Another is that they are involved in regulating gene expression.
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When root cells release the hormone abscisic acid (ABA), what is the result? a. Solutes exit guard cells, causing stomata to close
b. Epidermal cell secretions increase. c. Solutes enter guard cells, casing stomata to open. d. Root hairs grow in the direction of water and nutrient availability.
Of all the species that have ever lived on Earth, how many have gone extinct?
a. less than 1% b. about 10% c. about 25% d. about 75% e. about 99%
A mutant gene that produces brown eyes (bw) is located on chromosome 2 of Drosophila melanogaster, whereas a mutant gene producing bright red eyes, scarlet (st), is located on chromosome 3
Phenotypically, wild-type flies (with dull red eyes), whose mothers had brown eyes and whose fathers had scarlet eyes, were mated. The 800 offspring possessed the following phenotypes: wild type (dull red), white, scarlet (bright red), and brown. Most of the 800 offspring had wild-type eyes, whereas those with white eyes were the least frequent. (a) Using standard symbolism, diagram the cross from the P generation (brown-eyed mothers scarlet-eyed fathers) and the F1 generation. Be certain to provide the alleles of the mutant genes. (b) From the information presented above, how many white-eyed flies would you expect in the F2 generation?
By definition, if the DNA of a cell undergoes a spontaneous mutation, is was NOT due to ________.
A. spontaneous depurination of nucleotides B. insertion of transposons C. exposure to radiation D. errors in DNA replication