100 POINTS AND BRAINIEST FOR BEST COREECT ASNWER. Write a four-to-five sentence paragraph that explains how overexploitation con
1 answer:
<h2>overexploitation..</h2>
Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns. Continued overexploitation can lead to the destruction of the resource. The term applies to natural resources such as: wild medicinal plants, grazing pastures, game animals, fish stocks, forests, and water aquifers.
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When is the best time to harvest crops? why?
Correct timing of harvest is crucial to crop loss prevention. Grain losses may occur caused by rats, birds, lodging, insects, and shattering. Timely harvesting ensures good grain quality and high market value.
Harvesting too early will result in a higher percentage of unfilled or immature grains, which will lower the yield and cause higher grain breakage during milling. Harvesting too late will lead to excessive losses and increased breakage in rice. Harvest time also affects the germination potential of rice seed.
There are different ways to determine the correct harvest time:
Moisture content
Grain moisture content ideally is between 20−25% (wet basis). Grains should be firm but not brittle when squeezed between the teeth.
Ripe grains per panicle
The crop should be cut when 80−85% of the grains are straw (i.e., yellow-colored).
Number of days after sowing
Generally, the ideal harvest time lies between 130 and 136 days after sowing for late, 113 and 125 for medium, and 110 days for early-maturing varieties.
Number of days after heading
For dry season harvesting, an optimum time is 28 to 35 days after heading. In wet season harvest, optimum time is 32 to 38 days after heading.
Other considerations
Harvesting also needs to be timed so that threshing can be done as soon as possible after cutting to avoid rewetting and to reduce grain breakage.
If the crop has a lot of surface moisture, (e.g. from previous rainfall or early in the morning), it is advisable to wait until the surface moisture dries off.
From a Punnett square you can get the genotypic and phenotypic proportions of the progeny produced from a cross. Cross: PpRr x PpRr. F1: PPRR, PPRr, PPRr, PPrr, PpRr, Pprr, ppRR, ppRr, pprr.
<h3>What is a Punnett square?</h3>The Punnett square is a graphic representation that shows the different types of gamete combinations according to the alleles involved in a cross.
Punnett square shows the probabilities of getting offspring with different genotypes and their consequent phenotypes.
In the exposed example, we know that two genes are involved in the cross.
As we can see, there are dominant and recessive alleles for both genes.
Since each genotype in the square results from the combination of parental gametes, we can figure out which are the parental genotypes.
For instance, let us consider the provided genotypes
- PPRr.
We can assume one of the parents provided a P and a R dominant alleles, while the other parent provided another P allele but a r recessive allele.
PR + Pr ⇒ PPRr
- ppRr.
One of the parents provided a p recessive allele and a R dominant allele, The other parent provided another p allele and a r recessive allele.
pR + pr ⇒ ppRr
- pprr.
Both parents provided p and r recessive alleles.
pr + pr ⇒ pprr
From this information, we can assume parents are heterozygous for both genes.
Cross:
Parentals) PpRr x PpRr
Gametes) PR, Pr, pR, pr PR, Pr, pR, pr
Punnett square) PR Pr pR pr
PR PPRR PPRr PpRR PpRr
Pr PPRr PPrr PpRr Pprr
pR PpRR PpRr ppRR ppRr
pr PpRr Pprr ppRr pprr
F1) 1/16 individuals are expected to be PPRR
2/16 individuals are epected to be PPRr
1/16 individuals are expected to be PPrr
2/16 individuals are expected to be PpRR
4/16 individuals are expected to be PpRr
2/16 individuals are expected to be Pprr
1/16 individuals are expected to be ppRR
2/16 individuals are expected to be ppRr
1/16 individuals are expected to be pprr
For a better understanding, you will find the Punnett square in the attached files representing the parental gametes with different colors, and the resulting genotypes with a combination of these colors.
In this way, you will notice which gamete comes from which parent.
You can learn more about Punnett squares at
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