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nirvana33 [79]
3 years ago
14

A single ________ on the ________ chromosome plays a crucial role in the prenatal development of the testes.

Biology
1 answer:
Tju [1.3M]3 years ago
6 0

Answer:

A single gene on the Y chromosome plays a crucial role in the parental development of the testes.

Explanation:

Y chromosome is present only in males and this chromosomes is the distinguishing factor which separates males from females. It is the smallest chromosome but of utmost importance due to its sex determining feature. Up till now, studies show that Y chromosomes only carry limited amount of genes.  

The Y chromosome, most importantly, comprises of the SRY gene. This is the gene responsible for determining the testis and for the development of the testis. The SRY gene is responsible for sex determination.

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Compare actions of cocaine amphetamines and nicotine
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For amphetamine the immediate effects are quicker reaction times, feelings of energy/wakefulness, excitement, increased attentiveness and concentration, feelings of euphoria. Side effects of amphetamines can include heart palpitations, dry mouth, headache, hostility, nausea, cognitive impairment, severe anxiety, lack of appetite, teeth grinding, dizziness, increased heart rate, heart palpitations, rapid breathing rate, hypertension (high blood pressure), increased body temperature, erectile dysfunction, irregular heartbeat.

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8 0
3 years ago
A heron, a large wading bird, is hunting in a pond that contains three types of prey: fish, frogs, and snakes. All three types o
r-ruslan [8.4K]

The preferred prey item would be frogs.

What is optimal foraging theory?

It is a theory in ecology that proposes that predating animals that get the most energy from minimal efforts are favored by natural selection.

In order words, selection forces prefer investing minimum energy in order to extract maximally available energy.

In this case, the heron needs to use the lowest time to harvest the maximum energy possible. Since all the preys offer the same amount of energy, the one that requires the lowest time would be preferable for the heron.

In other words, frogs would be the most preferable prey.

More on foraging theory can be found here: brainly.com/question/16970714

#SPJ12

4 0
2 years ago
What is a toxic chemical produced by our excretory system called.
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Answer: ammonia

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