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viva [34]
3 years ago
10

Do all fishes have swim bladder? Justify your answer? Give a small answer please

Biology
2 answers:
Rus_ich [418]3 years ago
7 0

Lol I never thought swim bladder actually exists.

Well fishes that have bones contain swim bladder , while cartilegenious fish do not contain swim bladder. It is basically an organ fillled with gas allowing fish  to control their buoyancy, and thus to stay at their current water depth without having to waste energy in swimming. So only bony fish have swim bladder while cartilegenious fish do not.

muminat3 years ago
6 0

Answer:

Explanation:

Most fish rise and sink using this method, but not all do. Some species don't need a swim bladder because they spend all their life skimming along the ocean floor. Other fish, such as rays and sharks, ascend and descend by propelling themselves forward.

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In maize, liguleless (l) is recessive to having ligules (L), and dwarf (d) is recessive to tall (D). These two genes are linked
bearhunter [10]

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given,

LL║ll  and DD║dd,

after crossing over,    Ld║Ld  ×   lD║lD

LLdd × llDD

in F1 generation, they will give, LLll, DDdd, LLDD, lldd → LlDd

in eF2 generation, the offsprings will be, LLll  ×  DDdd

LLDD ,LLdd, LLDd, llDD, lldd, llDd, LlDD, Lldd, LlDd

1. yes, these genes are coupling.

2. → phenotypes of parental genes = ligules, liguleless, tall and dwarf

    genotypes of parental genes= LLdd, llDD i.e; heterozygous

 →   phenotypes of F1 generation = 25% Ligules, 25% tall, 25% ligules-tall, 25% liguleless-dwarf

      genotypes of F1 generation = heterozygous ; LlDd that is ligules-tall

3. recombination frequency= no of recombinant / total progeny × 100%

                                              = (1344+1344) / 6156+1344+1344+1156  × 100%

                                              = 2688/ 10000 × 100%

                                              = 26.88 %

that means linkage happened

and the map distance is 26.88 map unit.

8 0
3 years ago
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