The red-legged frog breeds in ephemeral ponds from January through March. Its relative, the bullfrog, breeds in permanent ponds from late March through May. There are two pre-mating isolation mechanism at play here,
1. Ecological isolation: The habitats are different, hence the individuals of both the species do not meet. Ephemeral ponds are temporary ponds that develop during rainy days, while the permanent ponds are full of water throughout the year.
2. Temporal isolation: The time of mating is different for both the species to avoid contact between the individuals of closely related species. Red-legged frogs mate in January to March slot and the bullfrog in the March to May slot.
False
it's made in the nucleus
Answer: 1. The resting membrane potential would become less negative (more positive).
Explanation:
Resting membrane potential is a voltage carried by a resting (non-signaling) neuron, or called as resting potential, across its membrane. The resting potential is determined by ion concentration gradients across the membrane, and the permeability of the membrane to each ion form.
In a resting brain, there are gradients of concentration across the Na+ and K+ membranes. Forces shift their gradients down through channels, resulting in a separation of charges that provides the potential for rest. The membrane is much more permeable to K+ than to Na+, so the resting potential is similar to K+'s potential for equilibrium.
Hence, the correct option is 1. The resting membrane potential would become less negative (more positive).
