What technique can be used for studying the gene for cystic fibrosis?
What will be an ideal response?
Molecular cloning
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An organism's response to the changes in the length of night compared to the length of the day is called ________
a. photoperiodism b. phytochromes c. gravitropism d. thigmotropism e. phototropism
Angiosperms include all
A. flowering plants. B. gymnosperms. C. ferns. D. mosses.
Which experiment would be the least effective follow-up to the peacock butterfly studies?
a. Repeat in a forest area totally devoid of native butterflies. b. Repeat in a wildlife sanctuary aviary after giving birds a chance to learn about peacock butterflies. c. Repeat using young, inexperienced birds. d. Repeat, and count survivors for three weeks. e. Repeat using more butterflies and more blue tits in a larger area.
In mammals, individuals with two X chromosomes are female, and individuals with an X and a Y chromosome are male
It had long been known that a gene located on the Y chromosome was sufficient to induce the gonads to form testes, which is the main male-determining factor in development, and researchers sought the product of this gene, the so-called testes-determining factor (TDF). For several years, the TDF was incorrectly thought to be a zinc finger protein encoded by a gene called BoY. Which of the following observations would most strongly suggest that BoY might not be the TDF? Explain your answer. (a) Some XY individuals that develop into females have mutations in a different gene, SRY, but are normal at BoY. (b) BoY is not expressed in the adult male testes. (c) Expression of BoY in adult females does not masculinize them. (d) A few of the genes that are known to be expressed only in the testes have binding sites for the BoY protein in their upstream regulatory sequences, but most do not.