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DENIUS [597]
3 years ago
10

As part of an experiment on circadian rhythms, a laboratory rat’s brain has been lesioned. The animal is now falling asleep and

waking up at random times of the day and night. Which part of the brain has most likely been damaged in this experiment?
Biology
1 answer:
Sergio039 [100]3 years ago
3 0

Answer:the part of the brain that has most likely been damaged in this experiment is the suprachiasmatic nucleus (SCN) found in the hypothalamus of the brain.

Explanation:

circadian rhythms are behavioural changes that respond to light and darkness in an organisms environment. The sleep-inducing wake cycle is a good example of a circadian rhythm. In the experiment, the disruption of the mouse SCN led to development of imbalances in the circadian rhythm of sleep and wake cycle leading to falling asleep and waking up at random times of the day and night. I hope this helps. Thanks

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3 0
3 years ago
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The diploid chromosome number for the body cells of a frog is 26. What would that number be after three generations if meiosis d
elixir [45]

Answer:

The number will be 208 after third generation.

Explanation:

Meiosis is a type of cell division that occur in eukarytotic reproductive cells and it divide diploid chromosomes into haploid chromosomes. Nuclear division happen twice in meiosis.

The diploid number for the chromosome number of frog is 26. There fore if there is no occurrence of meiosis before gametes are formed there won't be any reduction in the number of chromosomes. The gametes will be diploid and it will have the same number of chromosomes as the parent cell which is 26. Zygote will be formed after the egg fuses with the sperm.

The first generation will be 26 + 26= 52.

Second generation is 52 + 52=

104.

Third generation is 104 + 104 = 208.

The chromosome number will be doubling from generation to generation if meiosis did not occur. After theirs generation it will be 208.

4 0
3 years ago
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lukranit [14]

Answer:

D. Both lack membrane-bound organelles and are single-celled.

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Hence, the correct option is D.

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