(b) The grassland is ploughed up and turned into farmland. Crops of maize are grown on it

Biology

2 answers:

nata0808 [166]3 years ago

6 0

Answer:

the more corn grown the less nitrogen there will be in the soil thus the more corn grown the worse the yield will be

Explanation:

the farmer needs to alternate between fields to allow the soil to return to normal

Zielflug [23.3K]3 years ago

3 0

Answer:

i. Effect on the nitrogen cycle

will go on smoothly

ii. Effect on crop yield

will reduce

Farmer must do crop rotation in alternate season

Explanation:

Effect on the nitrogen cycle

Crop rotation is essential to restore the nitrogen content of the soil. Generally in one season a non leguminous crop is grown while in the other season a leguminous crop is grown. Leguminous crop allows the nitrogen with in the soil to be restored by the rizhobium bacterium. Since here only maize is grown year after year, the nitrogen cycle will go on smoothly.

Effect on crop yield

Crop yield will decrease as if same kind of crop is grown again and again, it causes depletion of essential soil and mineral from the soil and since crop change is not done thus no time is even allowed for restoration of such crops. Hence, crop yield will decrease ultimately.

Crop rotation must be done and some leguminous crops can be grown in alternate seasons to enhance the crop yield.

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A young couple went to see a genetic counselor because each had a sibling affected with cystic fibrosis. (Cystic fibrosis is a r

mel-nik [20]

Answer:

a) The correct answer is 1/2 or 0.5

Cystic fibrosis is a recessive disorder and her sibling has a disease but none of the parents had it. Thus, each of the parents must be the carrier of the disease, that is, both of them must be heterzygous.

So, if we cross Cc x Cc, it results in the genotype ratio of 1 (CC) : 2 (Cc) : 1 (cc)

Thus, 2 out of 4 would be the carrier of the disease.

b) 1/16

The probability of female to the carrier is 1/2

Same is the case with male partner due to the probability that he would be the carrier is 1/2

If both are carrier then, there is only 1/4 chances that the offspring will have the disease (as per cross shown above).

Now, the probability that the offspring will have the disease = product of all the above probabilities. (The probability of occurrence of two independent events is equal to the product of their individual probabilities).

So, $\frac{1}{2}x\frac{1}{2}x\frac{1}{4}$ = $\frac{1}{16}$

c) 1/8

The probability of female to be the carrier is 1/2

The probability male to be the carrier is 1/2

If both are carrier then, there is only 2/4 chances that the offspring will be the carrier of the disease (as per cross shown above).

Now, the probability that the offspring will be the carrier = product of all the above probabilities. (The probability of occurrence of two independent events is equal to the product of their individual probabilities).

$\frac{1}{2}x\frac{1}{2}x\frac{2}{4}$ = $\frac{1}{8}$