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densk [106]
3 years ago
5

Approximately, when was the structure of DNA first described? 1900 1950 1800 1850

Biology
2 answers:
d1i1m1o1n [39]3 years ago
8 0

It was not until 1953 that James Watson, Francis Crick, Maurice Wilkins and Rosalind Franklin figured out the structure of DNA — a double helix — which they realized could carry biological information

Aneli [31]3 years ago
8 0

Answer:

1950

Explanation:

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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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3 years ago
Which is the best definition of directional selection
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Is there a multiple choice or fill in the blank?
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People with type o-negative blood are referred to as universal donors, although if you give type o-negative blood to any patient
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There's an approximate 0.696% chance that one of those donors is a universal donor.
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Basaltic magma is very fluid. What type of volcano and eruption would basaltic magma most likely produce?
Dmitry_Shevchenko [17]

The right option is; C. cinder cone, a pyroclastic flow with no explosion

Basaltic magma is a fluid rock material produced from basalt and it has high amounts of iron and magnesium, and low amounts of silica. Basaltic magma is formed within the earth when a part of the earth's mantle is melted. Basaltic magma produces three different types of lava or volcanic deposits which are scoria, ash or cinder, and lava flows.

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Where does cellular respiration occur? (1 point)
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Answer:

Mitochondria

Explanation:

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2 years ago
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