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Alex
3 years ago
5

70. Based on the simple food chain for cod shown here, and what you know about the biology of cod, propose one action that peopl

e could take to help the cod population recover. (3 marks)
Phytoplankton (producers) -> zooplankton -> small fish, shrimp, crabs -> cod
Biology
1 answer:
AnnyKZ [126]3 years ago
4 0
Increase the number of small fish, crab and shrimp into the ecosystem
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Normal blood cells slide easily through narrow blood vessels. In sickle cell disease many red blood cells change to a crescent s
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Explanation:

The method of reproduction in humans is sexual reproduction: a type of reproduction that occurs when new organisms are produced through the coming together of genetic information from two individuals of different sexes mostly a male and a female (egg cell and the sperm). The genetic information for making the blood cells; the red blood cells genes in particular exists on chromosomes in the nucleus of the sex cells (egg and sperm cell) also called the gametes. Basically, the DNA provides instructions for the production of mostly all of the body's needs.

The genes coding for the sickle cells which is the abnormal red cell is always inherited in the recessive form meaning both parent has to possess one copy each of the defective gene in their DNA. For humans to get one copy of a sickle cell gene and one copy normal gene; it means one of the parents gametes (be it male or female) contributed the defective chromosome and the other normal gene is contributed by the other parent  during copulation giving rise to an individual that is heterozygous for the trait

For example, the sperm cell with the defective gene fertilizes the egg cell that has the normal copy of the gene producing an heterozgous individual.

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A is a eukaryotic cell while B is a prokaryotic cell

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The researcher can conclude that <u>cell A is eukaryotic while cell B is prokaryotic.</u>

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<u>Prokaryotic cells, however, lack a nucleus</u>. Their DNAs lie freely within the cytoplasm. This thus means that replication can only happen in the cytoplasm. Hence, it follows logically to find a new DNA segment in the cytoplasm of cell B.

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