Some regions of chromatin are very densely packed with fibers, displaying a condition comparable to that of the chromosome at mitosis. This material is called heterochromatin.

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#Id: 6263

#Unit 8. Inheritance Biology

RECESSIVE EPISTASIS

The recessive allele of one gene hides the expression of all alleles of another gene. Ex- coat color in Labrador retrievers

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#Id: 6858

#Unit 3. Fundamental Processes

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#Id: 2742

#Unit 13. Methods in Biology

Random amplified polymorphic DNA (RAPD) is a DNA marker that is defined by differences between individuals in terms of DNA regions either being or not being; amplified in a polymerase chain reaction primed by random oligonucleotide (usually, 10-mer) sequences. 

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#Id: 9899

#Unit 4. Cell Communication and Cell Signaling

The three known RLRs (RIG-I, MDA5, and LGP2) are CARD-containing RNA helicases that recognize viral RNAs, usually from RNA viruses such as influenza, measles, and West Nile.

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#Id: 9389

#Unit 11. Evolution and Behavior

Male stickleback fish develop red colour on their ventral side in the breeding season and maintain territories. 

When a conspecific male intruder enters their territory, resident males perform an aggressive display. 

The ethologist Niko Tinbergen presented models of different shapes to territorial male stickleback fish. He found that models of any shape elicited aggressive displays, provided the ventral part of the models was coloured red.