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Genes are segments of DNA located on chromosomes. A gene mutation is defined as an alteration in the sequence of nucleotides in DNA. This change can affect a single nucleotide pair or larger gene segments of a chromosome. DNA consists of a polymer of nucleotides joined together. During protein synthesis, DNA is transcribed into RNA and then translated to produce proteins. Altering nucleotide sequences most often results in nonfunctioning proteins. Mutations cause changes in the genetic code that lead to genetic variation and the potential to develop the disease. Gene mutations can be generally categorized into two types: point mutations and base-pair insertions or deletions.

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What are the four types of disease transmission?

Cerrena [4.2K]

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Infectious diseases are those that are transmitted from person to person by direct or indirect contact. Viruses, bacteria, parasites, and fungi all cause infectious disease. Malaria, measles, and respiratory illnesses are examples of infectious diseases.

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3 years ago

Read 2 more answers

In plants, which of the following are produced by meiosis?

prisoha [69]

Answer:

The correct answer is option c. Haploid spores.

Explanation:

In the plants, spores are normally unicellular and haploid and produced by the process of meiosis in the sporophytic body of the plant.

These haploid spores undergo the mitotic division and develop a new individual called gametophyte that forms gametes eventually.

Thus, the correct answer is option C. Haploid spores.

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3 years ago

Imagine that part of a population of South American finches is blown by a storm onto an island far offshore and manages to survi

lina2011 [118]

Answer: The observation "A" leads us to conclude that the finches populations are from two different species

Explanation:

According to the biological concept of species, a set of individuals are from the same species if they are able to reproduce and leave fertile offspring. This is key so one species can be successful and perpetuate through time. If they cannot leave descendants, then the species will be extinct. However, it’s possible that two individuals from different species mate and have descendants, but they cannot leave fertile offspring. When they are from different species, the offspring will be sterile and it is called a hybrid.

In the case of the South American finch, the island's finch population and mainland's finch population belong to different species because their offspring is sterile. To have different features, as different feather's color, or to have other dietary preference is not enough to say that they are different species. This is because within the same species, individuals can have variations. For example, we can different eye color and belong to the same species.

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Any membrane – bound structure inside a cell that performs a specific(e.g vacuoles store substance in the cell) is known as what

lys-0071 [83]

Answer:

Organelle

Explanation:

The general name given to membrane bound structures eukaryotic cell that perform specific function for necessary cell survival.

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Which organism has a single Loop circulatory system A.frog B.human C.fish D.dog

coldgirl [10]

The answer is a fish

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