Haploid plants can be produced in large numbers by anther and ovary cultures and from interspecific crosses.

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#Id: 6587

#Unit 7. System Physiology – Animal

Testosterone, secreted by the Leydig cells located in the interstitium of the testis, is essential for growth and division of the testicular germinal cells.

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#Id: 4910

#Unit 13. Methods in Biology

Variance is always non-negative since each term in the variance sum is squared and therefore the result is either positive or zero.

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#Id: 4564

#Unit 8. Inheritance Biology

Supplementary genes:

Two independent dominant genes interacting to produce a phenotypic expression different from that produced by either gene alone.

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#Id: 6902

#Unit 8. Inheritance Biology

Chromosome mutation - Difference from the wild type in the number or structure. 

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#Id: 5888

#Unit 3. Fundamental Processes

Incorrect base pairing leads to dramatically lower rates of nucleotide addition as a result of a catalytically unfavorable alignment of these substrates. This is an example of kinetic proofreading, in which an enzyme favors catalysis using one of several possible substrates by dramatically increasing the rate of bond formation only when the correct substrate is present.