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nadya68 [22]
3 years ago
10

An enormous cloud of gas and dust that contracts due to gravity and forms stars is a

Biology
2 answers:
Free_Kalibri [48]3 years ago
8 0

the answer is A. nebula


B. makes no sense. A galaxy is a large grouping of solar systems.

C. Constellation. is wrong. a constellation is a pattern of stars that are visible from the surface of the Earth.

D. meteoroid. is also wrong. Meteoroids are large, pieces of rock that are floating in space that have no life, and contain numerous minerals.

ale4655 [162]3 years ago
5 0

An enormous cloud of gas and dust that contracts due to gravity and forms stars is called a nebula.


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Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele.
VashaNatasha [74]

Answer:

a. Heterozygous individuals may pass on their copy of the disease-causing allele to offspring.

Explanation:

Tay-Sachs, which is a recessive lethal disease  ---- Let say the recessive lethal diseases is s

∴ it only results when an individual posses two copies of the diseases-causing allele i.e two copies of the disease will be ss.

Now, when two hetrozygous individuals crossed , it is obvious that each can pass on their copy of the disease-causing allele to the offspring.

Let show an illustration for the above statement.

Let the heterozygous individual be Ts, if Ts cross with another Ts;

we will have:

Ts × Ts

         T          s

T        TT        Ts

s        Ts          ss

the offspring are TT,Ts,Ts,ss

We can now see how the Heterozygous individuals pass on their copy of the disease-causing allele to the offspring (Ts).

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