Answer:
9:3:3:1
Explanation:
This question involves two different genes coding for height and flower color respectively. The first gene posseses allele T (dominant) and t (recessive) while the second gene possesses allele P (dominant) and p (recessive).
According to this question, two heterozygous tall and purple flowers are crossed i.e. (TtPp x TtPp). Each parent will produce the following gametes combination:
TtPp - TP, Tp, tP, tp
Using these gametes in a punnet square, the following proportion of offsprings will be produced:
T_P_ (tall, purple) = 9
T_pp (tall, white) = 3
ttP_ (short, purple) = 3
ttpp (short, white) = 1
Hence, the ratio of this cross is 9:3:3:1
Answer:
After the aphotic zone, there's complete darkness. From 1,000 meters below the surface, all the way to the sea floor, no sunlight penetrates the darkness
Explanation:; and because photosynthesis can't take place, there are no plants, either.
At the base of the brain is hypothalamus which received sensory signals from neurons and transmit it to pituitary gland. This gland releases hormones which play an essential role in controlling homeostasis. It often releases hormones of its own which then signal to pituitary gland. Hypothalamus is part of the limbic system
Answer:
option D. and B. and C.
Explanation:
option a. atmosphere contains 78% nitrogen, but it is in the crude form and very few organisms can absorb nitrogen in the atmosphere. so it is necessary for the nitrogen cycle to take place. therefore option a. is false
option b. ATP, adenosine triphosphate, contain Adenine, which has a portion of nitrogen. And nitrogen is known to be one of the main components of energy storing molecules.
option c. Nitrogen is an important part of amino acid, proteins and any of such.
option D. nitrogen is required for all organic molecules of organisms.
