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grin007 [14]
4 years ago
11

There are many types of crabs in the sea. Most of them have shells made from chitin, which is different from calcium carbonate (

it's actually the same stuff that your fingernails are made of). However, hermit crabs live in shells that are made from calcium carbonate. Where do these "houses" come from? Do the crabs make them?
Biology
1 answer:
Alenkasestr [34]4 years ago
3 0
They find shells that other crabs have left behind and use them
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176.8

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12 gray , 3 black, 1 brown

Explanation:

If Q allele of a gene on a separate chromosomes is epistatic to the B (black) and b (brown) color alleles, in cross between two animals with genotypes BbQq produces 12 gray coat color, 3 black coat color and 1 brown coat color animals.

                                        BbQq      x      BbQq

                                   Gray coat        Gray coat

                   BQ                  Bq                 bQ                 bq

   BQ    BBQQ(gray)  BBQq(gray)   BbQQ(gray)   BbQq(gray)

   Bq     BBQq(gray)   BBqq(Black)  BbQq(gray)   Bbqq(Black)

   bQ     BbQQ(gray)  BbQq(gray)   bbQQ(gray)   bbQq(gray)

   bq     BbQq(Gray)   Bbqq(Black)  bbQq(gray)    bbqq(brown)

So the phenotypic ratio is  Gray : Black : Brown

                                        =      12  :      3   :      1

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