How cells became different from one another during embryonic development?

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#Question id: 12411

#Unit 10. Ecological Principles

Plant population age pyramids

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#Question id: 17658

#Unit 7. System Physiology – Animal

Which of the following is the most accurate description of stress?

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#Question id: 5464

#Unit 8. Inheritance Biology

Two varieties of maize averaging AABBCC (200 inch) and aabbcc (80 inch) in height, respectively, are crossed. The F1 progeny is quite uniform averaging 140 inches in height allowed to self fertilization. If height is control by 3 pair of polygene, what is the height of following genotype of F2 plant?

I- AaBBCC     II- aaBbCC       III- aabbCc

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#Question id: 11746

#Unit 6. System Physiology – Plant

Sieve element sap is rich in sugars and other organic molecules, These molecules represent an energy investment for the plant. How their loss be prevented when sieve elements are damaged?

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#Question id: 15389

#Unit 8. Inheritance Biology

Why is tetrad analysis useful for studying genetics?