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Harrizon [31]
3 years ago
5

When a child is born with down syndrome when did the mutation occur

Biology
1 answer:
bazaltina [42]3 years ago
7 0

Answer:

Down syndrome occurs when the nondisjunction occurs with Chromosome 21. Meiosis is a special type of cell division used to produce our sperm and egg cells.

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What type of lenses were used for the first microscopes?
sergeinik [125]

Answer:

Here is some background information...

Explanation:

Leeuwenhoek (1633-1723) used melted glass balls to form lenses for apparently crude simple microscopes that nevertheless magnified up to 275 times! Modern tests have concluded that he could have achieved a resolution of two micrometres.

6 0
2 years ago
The movement of tectonic plates buries a rock deep inside Earth. Intense heat and pressure change the mineral composition of the
Tems11 [23]

Answer:

Rock B has a fine grainy texture and small crystals

Explanation:

1. still hasn't turned into sedimentary rock, or metamorphic. Its most likely gonna be igneous  and Igneous rocks have grainy texture and small crystals since its still developing

8 0
3 years ago
How much atp is produced from one glucose molecule if no oxygen is available to a muscle cell during contraction?
andrew11 [14]
Production of ATP in the absence of oxygen is called anearobic respiration. Under anaerobic respiration,two molecules of ATP is produced from one molecule of glucose. These ATP are used for energy production by the contracting muscles.
6 0
3 years ago
Match each interaction with its example.
Sati [7]

Answer:

1. Parasitism

2. Mutualism

3. Competition

4. Commensalism

Explanation:

The given are all different ecological relationships. These relationships how the members of the ecosystem interact with each other.

Parasitism is a relationship where one organism is harmed and the other one benefits. However, parasitism is specifically referring to a relationship where one lives inside the other organism, causing it harm by directly feeding off them or depriving it from getting nutrients.

Mutualism is a relationship were both organisms benefit from the relationship. In the example, the aphids provide protection for the ants while the ants provide food to the aphids (honey dew). Another example of a mutualistic relationship would be the tickbird and the rhino. The rhino benefits because the tickbird eats the ticks of the rhino, and in return, the tickbird is fed.

Competition is a relationship between organisms that compete for resources. In the case of your question the two grasses are competing against each other for the nutrients and water. Animals also share this type of relationship, especially when those that prey on the same animals for food.

Commensalism is a relationship between organisms where one benefits and the other does not benefit, but is NOT harmed. A good example would be the remora and sharks. Remoras are fish that swim with sharks. They swim beneath the sharks fins. The sharks provides them protection from other predators and remoras benefit because they get to eat scraps of the sharks food as well.  

4 0
3 years ago
How will this change in the environment most likely affect the mouse population?
Rashid [163]

Answer: i think it’s D

Explanation:

4 0
3 years ago
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