Biology, 25.02.2020 00:50 sobell7725

Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. Pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species. Are these two types of juniper considered reproductively isolated from one another?

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Answer from: barbaragomez27

The correct answer is: Yes, this is an example of Reproductive Isolation.

Explanation:

Reproductive Isolation can be defined as the mechanism adopted by different species during the course of their evolution, due to which the individuals belonging to different species are incapable of mating with each other and producing viable offspring.The given question is an example of Mechanical, Pre-zygotic Reproductive Isolation.Prezygotic Isolation refers to the mechanism adopted by individuals of different species during the course of evolution such that successful fertilisation of gametes from individuals of different species never occur, hence a viable zygote is never formed.Mechanical Isolation refers to the mechanism adopted by individuals of different species during the course of evolution such that their reproductive organs or the organs that assist in the process of reproduction are incompatible to each other. Hence, the gametes of each species are unable to come in vicinity of each other.Here, the pollen grain from the flower of one species of juniper is unable to form the pollen tube when its sits on the stigma of the flower of another species of juniper. This is an example of Mechanical Isolation.

Answer from: Quest

plato users

given bodies of water

pacific / arctic / indian / southern

$\left[\begin{array}{ccc}answers& choices\end{array}\right]$

[ a ] the caribbean sea

[ b ] the northern ocean

[ c ] the atlantic ocean

[ d ] the barents sea

with this being the given answers

$\left[\begin{array}{ccc}a\\b\\c& correct\\d\end{array}\right]$

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the framers of the constitution insisted that federal judges be nominated instead of elected due to their desire to have judges above the shifting whims of the masses.

the hope, whether achieved or not, was that federal judges would only be beholden to the law and that by not having judges be elected, they would be protected if that law dictated an outcome that ran counter to popular opinion.

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Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlappin...

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