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TLS Online TPP Program

#Id: 948

Active guanylyl cyclase causes the sperm cell to produce more cGMP, that activates a calcium channel in the cell membrane of the sperm tail.

#Unit 5. Developmental Biology #Fertilization in Sea urchin #Part B Pointers
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TLS Online TPP Program

#Id: 4701

#Unit 11. Evolution and Behavior

Each daughter receives an identical set of genes from her father, and the other half of a female’s genes come from her diploid mother.
TLS Online TPP Program

#Id: 4702

#Unit 11. Evolution and Behavior

Females are more related to their sisters (0.75) than they would be to their own offspring (0.50).
TLS Online TPP Program

#Id: 4703

#Unit 11. Evolution and Behavior
TLS Online TPP Program

#Id: 4704

#Unit 11. Evolution and Behavior

In haplodiploid organisms, males are haploid, and females are diploid. Consider the relatedness diagram shown below. Female A has a full-sister, Y, who has a daughter, B. The relatedness between A and B is ___________. 
TLS Online TPP Program

#Id: 4705

#Unit 11. Evolution and Behavior

Reciprocal altruism

Cases of altruism are known to exist between unrelated individuals. What drives this phenomenon is a “You scratch my back, I’ll scratch yours” behavior called reciprocal altruism.
TLS Online TPP Program

#Id: 4706

#Unit 11. Evolution and Behavior

A female vampire bat will regurgitate food to an unrelated female if needed, because at other times she may be the recipient of such a meal.