Trisomy 21, as illustrated by the karyotype, is caused by nondisjunction. This occurs when chromosomes do not separate properly during meiosis.
Answer is D) nondisjunction
When there is a high concentration of positive transcription factors but a low affinity for the positive transcription factor
Transcription factors are proteins that regulate the transcription of genes—that is, their copying into RNA, on the way to making a protein.
Proteins called transcription factors, however, play a particularly central role in regulating transcription. These important proteins help determine which genes are active in each cell of your body.
<h3>How does transcription factors affect gene expression?</h3>
Under the influence of transcription factors, the various cells of the body can function differently though they have the same genome. Transcription factors attach to one or more series sites, which are called transcription element binding sites (TFBSs), binding to specific DNA sequences of the genes they control
To learn more about transcription factors, refer
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Answer: the Earth is round.
Explanation:
Answer: false, for example, if a frog eats flies, and the flies are land animals, if they go extinct the frogs could die off, meaning any fish or water dwellers that eat the frogs can starve and cause a large chain reaction.
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Answer:
Termites have cellulose-digesting protists in their guts.
Explanation:
Termites are able to access nutrients contained in cellulose due to their mutualistic association with some cellulose-digesting protists such as <em>Trichonympha</em> and M<em>ixotricha</em>. The protists produce cellulase in addition to other glycolytic enzymes that work together to convert cellulose to malate.
The malate produced is further metabolized to produce 
, hydrogen, acetate and energy in the form of ATP.
The protists get sheltered in the termite's gut in return.
