MCQ
Mesogloea of Coelenterata contains
- ANerve cells
- BSensory cells
- ✓No cells
- DBranches of muscle cells
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Reason : Haemophilia occurs due to mutation of a structural gene on chromosome $15$.
$(A)$ The earliest organisms that appeared on the earth were nongreen and presumably anaerobes.
$(B)$ The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?
$I.$ Linkage
$II.$ Segregation
$III.$ Incomplete dominance
$IV.$ Independent assortment
Choose the correct option