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IrinaK [193]
3 years ago
9

David shows delayed intellectual development and has flattened facial features. The doctors explain that this genetic disorder i

s a result of extra genetic material in the 21st chromosome. Which disease is David suffering from?
Biology
2 answers:
Marysya12 [62]3 years ago
7 0
David is likely suffering from Down Syndrome.
charle [14.2K]3 years ago
6 0

Answer:

Down's syndrome

Explanation:

Down's syndrome is caused by trisomy of chromosome 21. Trisomy refers to the presence of three copies of one chromosome in the genome. Since David has extra genetic material in chromosome 21, he is suffering from Down's syndrome.

Down's syndrome would affect the mental development and learning process of David. He is likely to have a broad skull with a small mouth.

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The answer is similarly; similar environments.


<span>Convergent evolution suggests different organisms evolved <u>similarly</u> due to <u>similar environments</u>. </span>


Convergent evolution is a phenomenon of independent evolution of similar traits in species that are in different lineages. These traits are similar in form or function but were not present in the last common ancestor of those species.

There are many examples of convergent evolution among plants and animals.
Among the plants, both cactus and euphorbia are succulent plants, have spines, live in the deserts, but they belong to the different families.
Among the animals, dolphin, which is a mammal, is more similar to fish, than to other mammals. Or, both birds and bat, which is the mammal, have wings.

So, all these examples of convergent evolution suggest that the living in the similar environmental conditions led to development of similar forms between distinct species.
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