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MariettaO [177]
3 years ago
8

What happens when sand and gravel roll along a river bed?

Biology
1 answer:
Alenkinab [10]3 years ago
8 0
It serves as a barrier to biological activity. 
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I need help please ​
Temka [501]

Answer:

75 percent, 25 percent

Explanation:

5 0
3 years ago
Which of the following organisms is most likely to obtain nutrition via photosynthesis?
skelet666 [1.2K]
C. Euglena are likely are obtain nutrition via photosynthesis. 
5 0
3 years ago
Athletes with mono are typically held out of all physical activity for a period of _______ after diagnosis.
Xelga [282]
They are usually held out for a period of FOUR TO SIX WEEKS after diagnosis. Splenomegaly is an infectious disease that corrupt the spleen and the enlarged spleen usually persist even after all the symptoms have disappeared. Because of this, athletes should not resume active exercise too soon. Generally, the shortest period after which it is okay to resume active exercise is four weeks after all the symptoms have gone.
4 0
3 years ago
Alkaptoneuria is a recessive genetic disorder found among North American populations at a frequency of about 1 in 500,000 births
Dafna11 [192]

Answer:

The correct answer is - 1/41,493

Explanation:

Let assume the frequency of the two possible same allele genotype (dominant and recessive) in an inbred population is p and q. Then the frequency of heterozygotes (H) is denoted as:

2pq + 2pqF.  ( where F is the inbreeding coefficient).

The frequency of the two different hoozygotes in inbred population can be calculated as:

p2 + pqF and q2 + pqF. (Where p and q are the allele frequency of the dominant and recessive phenotype.

Given: Frequency of Alkaptonuria (q 2) = 1:500, 000

=> q = 1/707

p = 706/707 ( Approx values)

solution:

Inbreeding coefficient (F) = 1/64

Therefore,

Frequency of Alkaptonuria in second cousins= q 2 + pqF

= 1/500, 000 + (706/707 x 1/707) x (1/64)

= 1/500, 000 + 1/45, 248

= 1/41,493 (approx)

5 0
3 years ago
What would happen if the sister chromatids fail to separate in mitosis?
kondaur [170]
One of the daughter cell would have an extra chromosome while the other would be short one.  It's called nondisjunction

3 0
3 years ago
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