Biology Questions and Answers

Biology Questions and Answers

characteristics from each other by
means oand recombif genetic variability (mutationsnation) and natural
selection. When those differences reach

a point that makes the crossing oindividuals of one group with individualsf (^)
of the other group impossible or the
generation happens it is said that sof fertile offspring no longerpeciation has
occurred.

22. Why does geographical
    isolation lead to speciation?

Geographical isolation between groups
of the same sof a new species since pecies leait disallowsds to formation
crossing among isolated individuals.
Distinctgroups are characteristicincorporated s from thby genetice other

variabilityisolated groups u and natural ntil the emergence of aselection into the (^)
new species. So the geographical
isolation creatisolation. es the reproductive

23. How can the fact that
    fishes and dolphins have
    similar organs and similar
    general shape be explained?

Fishes aand shape because althond dolphins have similar orugh they havegans
phylogenetically distant ancestors they
face similarsince they share th environmental pressurese same habitat
(water). So by undergoing genetic
variabilitysimilar features, for example, and natural selection somthe e
hydrodynamic body and the presence of
fins, were incoranimals. porated into these

24. What is adaptive
    convergence?
    Adaptive convergence is the

phenomenon by which facing the same environmental pressureliving beings (^)
(problems) and undergoing genetic
variabilityincorporate and natural similar (analogoselectionus) organs (^)
and structures (solutions) into their
bodies during evolution. For the fins and the hydrodynamic body ofexample, (^)
fishes and dolphins, phylogenetically
distant animals.

25. What is adaptive
    radiation?

Adaptive raseveral other species frdiation is the appearancom one comme ofon (^)
ancestral species that have spread to
various regions odifferent characteristicr environms among theents. Th e
species correspond to the adaptive
necessitiesone occupies, i.e., to d of the ecological nichifferent es each
environmental pressures.

26. What is the difference
    between analogous and
    homologous organs?

Characteristicsaid to be analogous when having thes of different species are

same biological function, for example,

the wings of bats aninsects. d the wings of

Characteristicsaid to be homologous ws of different species arhen having thee (^)
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