In the normal male fetus,  the wolffian duct system on each side develops into the epididymis and vas deferens

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#Id: 6884

#Unit 3. Fundamental Processes

The DNA of the inactive X also becomes methylated at most of its CpG island promoters. Specialized histone octamers in which histone H2A is replaced by a paralog of H2A called macroH2A also become associated with the inactive X.

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#Id: 6834

#Unit 8. Inheritance Biology

Heritability- Phenotypic variation that is due to genetic differences. In addition to being polygenic, quantitative characteristics are frequently influenced by environmental factors. 

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#Id: 5467

#Unit 7. System Physiology – Animal

A synapse is a site where information is transmitted from one cell to another. 

Types of synapses:

1. electrical synapse

2. chemical synapse

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#Id: 9439

#Unit 11. Evolution and Behavior

Condition favor polygyny

Resource-based polygyny - Choosing dominant males, a female may be gaining access to good resources.

Harem mating structures - Sometimes males defend a group of females without commanding a resource - based territory. 

Ex- horses and zebras, some deer, lions, and seals.

Communal courting - In some instances, particularly in birds and mammals, males display in designated communal courting areas called leks.

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#Id: 1876

#Unit 10. Ecological Principles

K1>K2/β  and K1/α>K2- Species 2 goes extinct