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TLS Online TPP Program
#Question id: 15190
#Unit 8. Inheritance Biology
The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?
TLS Online TPP Program
#Question id: 19052
#Unit 13. Methods in Biology
Amino acids detected by spraying the plate with ninhydrin solution is an example of
TLS Online TPP Program
#Question id: 15835
#Unit 8. Inheritance Biology
You are interested in a new type of autosomal dominant mutation that gives purple eyes in Drosophila. You have a true-breeding purple-eyed line carrying a mutation that you call pr-1. You have isolated a second purple-eyed mutation that you call pr-2, which you have established in a true-breeding line that also carries a recessive marker st, which gives stubby legs. You cross a fly from the pr-1 line to a fly from the st, pr-2 line producing F1 females which you then cross to males from a true breeding st line (normal eyes). From this cross, 1000 progeny flies can be categorized into four different phenotypic classes:
What is the distance between pr-1 and pr-2 in cM?
TLS Online TPP Program
#Question id: 1201
#Unit 4. Cell Communication and Cell Signaling
Epinephrine binds to the same type of receptors in liver, fat, and smooth muscle cells. Yet in liver, glycogen breaks down; in fat, triacylglycerols break down; and smooth muscle cells relax. How can the same hormone produce three such different responses?
TLS Online TPP Program
#Question id: 28434
#Unit 5. Developmental Biology
Primitive Streak is homologous to_____