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Genetics

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Nedra O'Kon

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Cards in this guide (14)
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 is condominance

There is no such thing as condominance. You are putting the word condom into your biology homework. Check your spelling, and then look the definition up in a book, or use Google.

What must happen before meiosis can begin

DNA doubles and produces sister chromatids before meiosis begins.

the chromosomes must replicate

Which phase occurs directly after G1

S Phase - period of DNA replication - 10% shorter than G1.
After G1 phase S phase occurs.

What would most likely decrease the genetic variation in the human population

Which would most likely decrease the genetic variation in the human population?

What is true of the allele pair of someone with a genotype TT

The allele pair of someone with a genotype TT is homozygous dominant.

Genetic disorders can result when chromatids fail to separate properly. During with phase is this problem most likely to occur

Anaphase

What would happen if crossing over didn't happen during meiosis in humans

If crossing over didn't happen during meiosis in humans, the haploid daughter cells would all have the same genes. The crossing over creates variation and causes each daughter cell to have slightly different genes.

How are meiosis and mitosis different

mitosis only has to do with celluar reproduction

meiosis has to do with sex cells reproducing
Mitosis creates new cells that are used for development, repair, asexual reproduction and growth. Meiosis creates cells in order for organisms to reproduce sexually.

Why did Mendel wanted to find out if the color of the seed of a pea plant affected the seed shape What experiment did he perform to test his idea

He tested seed color and shape at the same time.

APEX

Which best describes probability

the likelihood that something will happen

What do X and Y chromosomes affect

(Apex Learning) Whether someone is a female or male.

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