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aliina [53]
3 years ago
14

4. What is an example of positive feedback?

Biology
1 answer:
Shtirlitz [24]3 years ago
4 0

Answer:

C

Explanation:

It is known as lactation. The suckling action of an infant produces prolactin, which leads to milk production; more suckling leads to more prolactin, which in turn leads to more lactation. This is a positive feedback system as the product (milk) produces more suckling and more hormone. When the child is no longer breast feeding, the prolactin drops off and milk production goes down.

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Both Duchenne muscular dystrophy and color blindness are caused by recessive alleles. DMD, unlike color blindness, nearly always
Ronch [10]

Answer: Although both are X-linked recessive conditions, and therefore more likely in males, with the single X-chromosome. The recessive allele in colour blindness occurs at a higher frequency in the population and is a mild condition. Thus colour blindness does occur to a lesser extent in females because it needs the double recessive condition. DMD is a severe, disabling condition with a limited lifespan, and recessive allele frequency much lower, so the double recessive condition in females is very rare.

Explanation: DMD is an X-linked recessive, “nearly always in males” suggest that it also occurs due to a new mutation or some rare condition e.g. double recessive from an affected father and carrier mother, or inactivation of the normal gene in a heterozygote. It is also found that the defective allele is not completely recessive and that female carriers may exhibit mild to moderate effects.

colour blindness is polygenic, although the genes are all X-linked. It is more common in males than females. Females can carry two recessive alleles and so express the phenotype, but this is uncommon because the frequency of the recessive gene is low.

There are similarities in that both are X-linked recessives, therefore commonly expressed in males, who only have one X chromosome. The gene frequency of the colour blindness recessive is much higher than that of DMD, so the double recessive condition, which affects females, is more likely to be seen with colour blindness. In addition, DMD is a severe condition associated with disability and limited lifespan, which reduces the probability of mating between an affected male and carrier female

6 0
2 years ago
Imagine you do a DNA fingerprinting in a forensics lab. You obtain nine samples from a crime scene and use them to make DNA firn
Nadya [2.5K]
You didn’t attach a picture, when you attach a picture of the fingerprints we can solve the problem!
6 0
3 years ago
The x-ray film shows a fracture where one side of the cortex is intact and flexed and the other side has signs of interruption (
zalisa [80]

Answer:

The correct answer is - option B.

Explanation:

Greenstick fractures are the type of fractures where one side of the cortex is intact and flexed while the other side is fractured. This type of fracture known as the incomplete fracture,

If any fracture have two or more lines of fracture it is called as Comminuted fractures. Impacted fractures have one segment on other. Due to the performing same activity again and again stress fracture occures that is characterized by failure of one cortical bone.

Thus, the correct answer is option B.

3 0
3 years ago
What is reproduction
viva [34]
It's basically to reproduce. You are here because of reproduction from your parents.
5 0
3 years ago
Read 2 more answers
PLEASE HELP? WILL MARK BRAIN( ANSWER APPROPRIATELY)
salantis [7]

Answer:

Since some fish eat algae likely an algae bloom will occur.

Explanation:

Harmful algal blooms (HABs) occur when algae — simple photosynthetic organisms that live in the sea and freshwater — grow out of control while producing toxic or harmful effects on people, fish, shellfish, marine mammals, and birds. This can have a detrimental impact and it looks disgusting. It would most likely kill off the marine life in that area.

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