Answer:
C. Disruptive Selection
Explanation:
Disruptive selection occurs when two extremes of continuous variation are favored more than intermediate traits.
The extremes of continuous variation exhibited in this species of snail is the color of their shell which allows them to blend with the background of their habitat.
The shady forest of the habitat makes the dark-shelled individuals to be better hidden from bird predators, while the light-shelled individuals are better hidden in well-lit brushy edge areas. This disruptive coloration exhibited by both individuals makes both individuals of this species of snail less vulnerable to predation.
Both individuals of this species both extremities would naturally survive in this habitat as snails with intermediate extremities would be highly preyed on since there is no area of intermediate brightness in the habitat to make them invisible to predators
Epiglottis is the <span>protective tissue that covers the trachea when you swallow</span>
Answer:
The order must be K2→K1, since the permanently active K1 allele (K1a) is able to propagate the signal onward even when its upstream activator K2 is inactive (K2i). The reverse order would have resulted in a failure to signal (K1a→K2i), since the permanently active K1a kinase would be attempting to activate a dead K2i kinase.
Explanation:
- You characterize a double mutant cell that contains K2 with type I mutation and K1 with type II
mutation.
- You observe that the response is seen even when no extracellular signal is provided.
- In the normal pathway, i f K1 activat es K2, we expect t his combinat ion of two m utants to show no response with or without ext racell ular signal. This is because no matt er how active K1 i s, it would be unable to act ivate a mutant K2 that i s an activit y defi cient. If we reverse the order, K2 activating K1, the above observati on is valid. Therefore, in the normal signaling pathway, K2 activates K1.
Fimbriae are the primary means by which <em>Neisseria gonorrhoeae </em>attaches to the mucous membranes of the reproductive tract.
<h3>What is gonorrhea?</h3>
- Gonorrhea is a sexually transmitted disease (STD) caused due to bacterium <em>Neisseria gonorrhoeae</em>. This bacterium attaches with the help of fimbriae.
- <em>N. gonorrhoeae</em> infects the reproductive tract and attaches to the mucous membranes of cervix, uterus, and fallopian tubes in women, and the urethra in both women and men.
- This bacterium can also be transmitted through sharing of contaminated needles, from mother to child during birth.
- Gonorrhea can lead to pelvic pain, pus discharge from reproductive organs, painful urination.
- It can lead to infertility and risk of HIV/AIDS infection.
- To prevent infection, do not have unprotected sex, avoid sharing needles, regularly check for gonorrhea infection.
Learn more about gonorrhea here:
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