Selective breeding is the traditional method for improving crops and livestock, such as increasing disease resistance or milk yield.
Genetic engineering is a faster way, which transplants genes for a desired characteristic into an organism. However, genetic engineering offers many potential benefits but carries the risk of unexpected harmful effects.
instead of deoxyribose.
a. 1, 2, and 3
b. 1 and 2
c. 2 and 3
d. 2 only
Answer:
i think it's A
Explanation:
Answer:
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Explanation:
Organism characteristics are influenced by the amino acid sequences of proteins coded by their DNA. Amino acids vary in chemistry and structure thereby causing variation in protein structure and function. Similarities in sequences can infer close evolutionary relationships.
The characteristics of an organism are fundamentally determined by the amino acid sequences of its proteins. Protein sequences, composed of the 20 common amino acids, are coded by the DNA molecule in the cell. Therefore, the sequence of a DNA molecule plays a significant role in understanding an organism's identity and function.
Different amino acids have different chemistries and structural constraints, thus causing enormous variation in protein structure and function. This variety is responsible for the diversity and complexity of life. For instance, the human cytochrome c protein contains 104 amino acids, but when compared to the same protein in different organisms, only 37 of these amino acids appear in the same position. This suggests these organisms are descended from a common ancestor.
Moreover, the 3-dimensional structure of proteins, determined by the amino acid sequence, contains significant information about evolutionary relationships. These relationships can be inferred from variations over time of the nucleotide sequence of a gene. The more similar these sequences are in two organisms, the more closely related they are.
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Correct answer: Genetic Drift
Genetic drift is defined as the random change in the allele frequency of a population is changed by chance or due to random changes in the environment. It is a random process that can lead to large changes in the overall population in a short period of time. It is a mechanism of evolution and it does produce the adaptation.
Hence, the correct answer would be genetic drift.
Answer:
Genetic Drift
Explanation:
Genetic drift refers to the evolutionary agent that brings about the changes in the gene pool of the population by some chance event. In the given example, half of the polar bear population was wiped out of the habitat by any chance event such as natural calamity, epidemic disease or any other random events. Since no mutation or natural selection was responsible for the death of polar bears, it is an example of genetic drift.
Genetic drift is more effective in small populations. And the size of the population of the polar bear was also small to allow the genetic drift to cause the changes.
A) do not change over time.
B) do not contain any genetic material.
C) are much smaller than anything alive.
Eliminate
D) are not composed of one or more cells.
The correct answer is D.} Are not composed of more than one cells.
Answer:
All living organisms show movement of one kind or another. All living organisms have internal movement, which means that they have the ability of moving substances from one part of their body to another.