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grandymaker [24]
3 years ago
15

What is a biogeochemical cycle?

Biology
1 answer:
mamaluj [8]3 years ago
3 0

Answer:In ecology and Earth science, a biogeochemical cycle or substance turnover or cycling of substances is a pathway by which a chemical substance moves through biotic and abiotic compartments of Earth.

Explanation:

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Meiosis reduces chromosome number and rearranges genetic information. Explain how the reduction and rearrangement are accomplish
Alisiya [41]

Answer:

Explanation:

Meiosis is a form of cell division that occurs in the sex cells of organisms. It ensures the reduction of a diploid cell to an haploid cell to allow for the formation of a diploid zygote after fertilization (contribution of both parents haploid sex cells to give a diploid zygote). Thus, this process is very essential and important.

The reduction is accomplished by 2 divisions after the duplication of chromosomes

- first division: separation of homologous pairs of chromosomes (this reduces the total in half)

- second division: separation of sister chromatids of a chromosome.

The rearrangement in meiosis occurs by crossing over/genetic recombination.

This is the exchange of genetic material between homologous pairs of chromosome bringing about a rearrangement and genetic variation

An example of a chromosomal abnormality that arises as a result of defects in this process is the Down Syndrome which is caused by a nondisjunction of the chromosomes 21 pair in a sex cell.

This condition produces offsprings that have some characteristic facial features, short stature etc

6 0
3 years ago
What instruction or code is responsible for all the inherited traits of an organism
Charra [1.4K]
Genetic material called DNA. Deoxyribonucleic acid is what DNA stands for<span />
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3 years ago
Much important confirmatory evidence on the genetic code has come from assessing changes in the amino acid sequence of mutant pr
Reil [10]

Answer:

The correct answer is -

A. a, c, g

B. e, b, f & d

Explanation:

Part A- the options a, c, g are the options that show mutation or replacement by a single base change

a) Phenylalanine: UUU UUC

Leucine: UUA UUG

Only one base change

c) Alanine:  GCU  GCC  GCC GCG

   Thr:         ACU ACC ACA ACG

only one base change

g) Prolin:  CCU CCC  CCA  CCG

  Serine: UCU UCC  UCA UCG

Part B:

All other replacements will not be consistent with the Genetic Code if single base substitutions occur in option e, b, f & d

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Many people throughout the world are practicing vegetarians. those who are pure vegans are at risk for nutritional deficiencies
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A vegans diet does not include natural protein that can be found in foods such as meat and milk.
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