Rhizobial genes that participate in nodule formation are called nodulation (nod) genes. Only one of the nod genes, the regulatory and constitutively expressed and regulates the transcription of the other nod genes;

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#Question id: 16488

#Unit 12. Applied Biology

Advantages of organ culture are

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#Question id: 5233

#Unit 11. Evolution and Behavior

The most important feature that permits a gene to act as a molecular clock is ________.

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#Question id: 3286

#Unit 11. Evolution and Behavior

 In a human population, the gene frequencies of the alleles for the ABO system are as follows:

A = 29%                         B = 7%                                    0=64%

Assuming complete random mating and Hardy-Weinberg equilibrium,

What are the blood type A frequencies in this population?

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#Question id: 13221

#Unit 6. System Physiology – Plant

There are two main types of water-transporting cells in the Xylem,

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#Question id: 2277

#Unit 2. Cellular Organization

A gram-positive bacterium is stained _______________ by the gram stain