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When genes are on the same chromosome but very far apart, they assort independently due to crossing over (homologous recombination). This is a process that happens at the very beginning of meiosis, in which homologous chromosomes randomly exchange matching fragments.

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Is used to make multiple copies of a particular gene?

The Polymerase Chain Reaction (PCR) technique employs a heat-stable polymerase in a chain reaction, replicating DNA exponentially.


Which of the following would be an example of Mendel's classic cross?

An example of Mendel's classic cross would be crossing pea plants that are purebred for tall height with pea plants that are purebred for short height, resulting in a first-generation hybrid offspring that are all tall.


What does it mean when we say that a gene is expressed?

When we say that a gene is expressed, it means that the information encoded in the gene is used by the cell to make a specific protein or functional RNA molecule. This process is known as gene expression.


Why do tetrads exchange DNA?

Tetrads exchange DNA through the process of crossing over during meiosis. This genetic recombination promotes genetic diversity among offspring by shuffling alleles on homologous chromosomes. It also helps in creating variability in the gene pool, increasing the chances of producing individuals with advantageous traits.


How many gametes are formed by individual of genotype AaBbcc?

A faster way to do it is by (2^n) where 2 is the number of alleles and n is the number of genes, so we have 2^3 = 8. so we have 8 possible combinations. Assuming you are asking how many different types of gametes can an individual with the genotype AaBbCc make. To answer we must first make one assumption: each gene resides on a different chromsome. The reason we do that is to simplify the analysis by making use of Mendel's Law of Independent Assortment. The possible genotypes in the gametes are thus: ABC ABc AbC Abc aBC aBc abC abc Independent Assortment allows us to determine the answer by simply listing out all of the possible combinations of alleles. However, if all or some of the genes are on the same chromosome, the answer becomes much more difficult, because then one has to know the probability of recombination between the genes. The closer in physical proximity on the chromosome the genes are, the less probable recombination (crossing over) will occur between them, because it's more difficult for crossing over to happen on very short stretches of DNA.

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