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Elina [12.6K]
2 years ago
12

The diagram shows the embryo development of four vertebrates and suggests all of the following EXCEPT A) common ancestry of vert

ebrates. Eliminate B) there are no similarities in the embryos of all four groups. C) there are very few differences in the early development of any vertebrates. D) common features (gills and segments) in the embryos of all vertebrates.
Biology
1 answer:
Alex Ar [27]2 years ago
6 0
The answer should be D. Hope I Helped!
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Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele.
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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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Explanation:

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