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inysia [295]
2 years ago
15

Which marine creature was thought to be extinct for 80 million years until one was caught off the coast of Madagascar in 1938?

Biology
2 answers:
kipiarov [429]2 years ago
8 0

Hello There!

C)Coelacanth

Coelacanths were once thought to have undergone extinction 66 million years ago during the Cretaceous–Paleogene extinction event. ... The fossil record is unique because coelacanth fossils were found 100 years before the first live specimen was identified.

Valentin [98]2 years ago
4 0

The answer is C. Coelacanth


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If you have a pet cockroach with a brown body, how could you find out if it is
aleksklad [387]

Answer:

by testcrossing with a homozygous recessive partner

Explanation:

<u>If a pet cockroach exists whose zygosity is unknown, this can be determined by a test cross. A test cross involves crossing an organisms whose zygosity is unknown with a partner that is homozygous recessive for the same trait.</u>

Let us assume that brown body is represented by the allele B, the dominant allele. The homozygous recessive version would be bb.

The genotype of a brown cockroach whose zygosity is not known can be denoted as B_, where '_' can be a 'B' or a 'b'.

When B_ is crossed with bb:

B_   x   bb

Progeny

2 Bb

2 _b

The phenotype of Bb would be brown (since B is dominant over b) while the phenotype of _b would depend on the zygosity level of the cockroach.

If the unknown genotype is BB, then _b becomes Bb and the phenotype will be a brown body. This means that all the progeny will appear brown. (<em>see the first attached image for the Punnet's square</em>)

In other word, if the unknown genotype is bb, then _b becomes bb and the phenotype will be a alternate color (non-brown) body. This means that 50% of the progeny will appear brown while the remaining 50% will be in the alternate color. (<em>attached</em>

3 0
3 years ago
Define cell conjunctions
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allsm [11]

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