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creativ13 [48]
3 years ago
15

Pleeaseee heeelpppppp

Biology
1 answer:
kondaur [170]3 years ago
8 0

The correct answer is option D, Speciation

In the allopatric speciation, the geographical barriers such as mountains or rivers causes isolation of the population. The two population groups get completely separate from each other and thus develop different sexual preferences for mating.


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B=black and b=brown. A Bb guinea pig crosses with a Bb guinea pig, and four offspring are produced. All of the offspring are bla
Sladkaya [172]

If two Bb guinea pigs cross, there are four possible outcomes:

  • both pass the B: the son is BB
  • one of the pass the B and the other pass the b: the son is Bb
  • both pass the b: the son is bb

Since B (being black) is dominant, the son will be black in both BB and Bb cases. In order for a son to be brown, he must be a pure bb specimen.

So, if all of the offspring are black, it means that all four guinea pigs are either BB or Bb, which in turn means that at least one of the parents passed the B gene.

8 0
4 years ago
Both klebsiella pneumoniae and streptococcus pneumoniae avoid phagocytosis by releasing a-b toxins that kill leukocytes.
Kobotan [32]
This is a false statement.

Klebsiella pneumoniae and Streptococcus pneumoniae are two bacteria who are encapsulated, that means that they are surrounded by an envelope. This capsule is critical to their pathogenicity since it protects them from the phagocytes of the human immune system. Certain proteins located on the surface of their capsule prevent the phagocytic cell from adhering to the bacteria and engulfing it. 
7 0
3 years ago
How are gametes different from all of the other cells that make up an organism
12345 [234]

Answer:

How are gametes different from all of the other cells that make up an organism.

Reasons are not far fetched as result of fertilization occurrence after mating which leads to having multiple cells in a gamete. The fusion of male and female organism leads to formation of gametes which consists of multiple cells

Explanation:

4 0
3 years ago
Two scientists in British Columbia are counting trout spawning grounds (called redds) along 5 km of a stream. The presence of
Eva8 [605]

The most likely reason for the scientists to count different numbers of redd is the observer’s efficiency.

Explanation:

In a field survey based on visual counting for visual stock assessment, the scientists may count a different number of redds each time in the same area due to the observer’s or the scientist’s efficiency.

The same place may first appear as redd and then later may not and accordingly the scientist's count also varies.

This error happens due observer’s inexperience in surveying, misidentification of redd species, changes or variations each time in the redd habitat, survey life, characteristics, spawning shifts etc., and poor temporal and spatial coverage.

8 0
3 years ago
WILL GIVE A BRAINLEST
Rasek [7]
Widespread use of pesticide has lead to the development of:

More pesticide-resistant insects.
5 0
3 years ago
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