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Genetics

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Obie Bradtke

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What is a chromosome

A chromosome is a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order. It is also known as tightly wound DNA. It is a structure that DNA wraps around.

MORE INFORMATION:

A chromosome is an organized structure of DNA and protein that is found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA-bound proteins, which serve to package the DNA and control its functions.

Chromosomes vary widely between different organisms. The DNA molecule may be circular or linear, and can be composed of 10,000 to 1,000,000,000 nucleotides in a long chain.

Cells may contain more than one type of chromosome; for example, mitochondria in most eukaryotes and chloroplasts in plants have their own small chromosomes.

Chromosomes are the essential unit for cellular division and must be replicated, divided, and passed successfully to their daughter cells so as to ensure the genetic diversity and survival of their progeny.

Chromosomal recombination plays a vital role in genetic diversity. If these structures are manipulated incorrectly, through processes known as chromosomal instability and translocation, the cell may undergo mitotic catastrophe and die, or it may aberrantly evade apoptosis leading to the progression of cancer.

In practice "chromosome" is a rather loosely defined term. In prokaryotes and viruses, the term genophore is more appropriate when no chromatin is present. However, a large body of work uses the term chromosome regardless of chromatin content. The simplest genophores are found in viruses: these DNA or RNA molecules are short linear or circular genophores that often lack structural proteins.

Chromosomal DNA encodes most or all of an organism's genetic information; some species also contain plasmids or other extrachromosomal genetic elements.
Structure in nucleus made of DNA and protein. Sections of a chromosomes are genes.
structure in a cell's nucleuse thaat contians genetic material
A chromeosome is organized structure of DNA and protein that is found in cells.
coiled strands of genetic material
coiled strands of genetic material

What is an allele

a form of a gene apex

What must happen before meiosis can begin

DNA doubles and produces sister chromatids before meiosis begins.

the chromosomes must replicate

Which structure is found in both plant and animal cells

Mitochondria or ribosome

What allows humans to have different traits from each other

They have different genes.

The different genes they get from they're parents. There is something that happens in Meiosis where the chromosomes kind of switch spots, it's called Crossing Over. See the website in the related link - I know it's a childrens website, but it explains it well. Its under Step One.

Why did Mendel study such a large sample of pea plants to determine the probability of inheritance

The more samples you use, the closer your results will match probability.

Frederick Griffith made a scientific discovery in 1928 Which best describes the knowledge about genetics before 1928

Scientists did not know how traits were inherited.

What would decrease genetic variation in a population

inbreeding

How did Avery help build our understanding of genetics

He showed that DNA is a Transforming factor.

A cell membrane is very specific about what it allows across. How does this help the cell
What would most like happen if green plants where exposed to less sunlight

The plants will tend to grow lanky and weak, while the leaves will turn yellowish.

Why deos A mother has one allele for dimples and one allele for no dimples What is the probability that she produces a gamete with the allele for dimples

Answer is 50% :: Apex

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