Describe the approach using genomics to identify genes that contribute to the variations in cognitive ability observed in humans
What will be an ideal response?
This approach uses SNPs and other DNA markers to identify chromosome regions that contain genes related to specific traits. Identifying the number of these regions associated with variation in a specific phenotype is an indirect way of determining whether that phenotype is controlled by many genes, each having a small effect, or by a small number of genes, each with a major effect on the phenotype. One study has provided strong evidence that a large proportion of individual differences in intelligence is due to genetic variation, and that many genes, each with a small additive effect, are involved in these differences.
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What is alternative RNA splicing?
a. a mechanism for cleaving RNA into progressively smaller pieces for disposal b. a mechanism for patching together multiple RNA transcripts to form large and complex instructions for quaternary level proteins c. a mechanism that allows different protein products to be produced from one gene when different exons are combined to form the mRNA d. an out of control splicing mechanism only seen in cancerous cells
Which letter(s) in the accompanying figure represents the ovaries, where meiosis in diploid germ cells gives rise to
eggs? a. A
b. B c. C d. D e. both A and B
Kidney stones form in the
a. renal pelvis. b. ureters. c. urethra. d. urinary bladder. e. glomerulus.
Birds, like mammals, can regulate their body temperatures within close limits. Therefore birds and mammals are called
A. heterothermic. B. poikilothermic. C. endothermic. D. ectothermic.