Answer:
Sorry only paragraph I'm on phone.
Explanation:
Fruits and vegetables have changed a lot since the onset of agriculture 10,000 years ago, as generation after generation of farmers artificially bred crops to select for more desirable traits like size and taste.
I will answer the question accordingly so that it help you under stand it better.
Question A.
During an extreme heat wave, plants with white flowers survive better.
What mechanism is in work here?
Answer: Mechanism of Natural Selection
will work here. This is called survival of the fittest which means the best color which fits in harsh conditions will dominate over others and will survive for longer time.
What is the effect on the gene pool?
Answer: The Frequency of white allele will increases
because white color is the best fit to extreme heat wave.
Question B.
A person uproots the five closest plants, which all happen to have white flowers.
What mechanism is in work here?
Answer: The mechanism of gene flow will work here as color of flower represents genotype of flower.
What is the effect on the gene pool?
Answer: The Frequency of white allele will increases because genotype of white flowers is increased.
Atlantic and Pacific Ocean
Answer: The true statement is: Autocrine signals are produced by and act upon the same cell
Explanation:
Autocrine signals are made by cells producing hormones or molecules that acts on the same cell that produces it.
Usually, these autocrine hormones bind to receptors positioned in the cells producing them and thereby signal/exert changes in the cell.
Other options contains false statements
- Steroid hormones are produced ONLY when needed, not produced in advance and then stored
- Neurohormones do not help in the transmission of nerve impulses; So, they ARE NOT neurotransmitters
- Paracrine signals exert their effects on nearby cells; thus, they are not for long distance communication.
The ONLY true statement is that 'Autocrine signals are produced by and act upon the same cell.'
