In drosophila, the somatic cells of the hub are able to regulate stem cell proliferation by secreting the paracrine factor Unpaired onto the cells attached to them. Unpaired activates the JAK-STAT pathway in the adjacent germ stem cells to specify their self-renewal. Those cells that are distant from the paracrine factor cannot receive this signal, they begin their differentiation into the sperm cell lineage. This means hub cells act as

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#Question id: 4586

#Unit 11. Evolution and Behavior

 What are adaptations?

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#Question id: 12527

#Unit 6. System Physiology – Plant

Which of the following is the incorrect prediction about ABA translocation in vascular tissue by both the xylem and the phloem?

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#Question id: 13177

#Unit 10. Ecological Principles

Deserts typically occur in a band at 30 degrees north and south latitude because

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#Question id: 9583

#Unit 6. System Physiology – Plant

 A mechanism known as the Q cycle accounts for most of the observations in which structure and reactions of plastoquinone that operate in,

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#Question id: 17809

#Unit 8. Inheritance Biology

In humans, albinism (unpigmented skin, hair, and eyes) is due to an enzymatic deficiency, and it is an autosomal recessive trait. Suppose that in a small country of one million people (“Generation 1”), there are 500 aa albinos and 9000 Aa heterozygous carriers. What is the probability that a child will be albino if: Both parents are members of Generation 2, and one parent is albino and the other is non-albino.