In meiosis a crossover in one position is thought to inhibit

In meiosis, a crossover in one position is thought to inhibit crossing-over in the neighboring regions. This regulatory mechanism ... results in a very uneven distribution of crossover points along each chromosome ensures that even small chromosomes undergo at least one crossover controls how the Holliday junctions are resolved All of the above In cells that are exposed to sunlight, ultraviolet (UV) light can result in covalent linkage between two adjacent DNA bases. If not repaired in time, such dimers can lead to inheritable mutations. Consider the sequence 5-GGTATGATCATTATAA-3\' in the chromosome of a cell that is exposed to intense sunlight. How many possible dimers can form in the region of DNA corresponding to this sequence (only the strand shown)? state your answer in writing, i.e. if your answer is 4, write four instead

Solution

ensures that even smallchromosomes undergo at least one cross over.

pyrimidine dimers from cytosine or thymine since there are two thymine together just once in sequence so it forms one dimer also if it asks about complimentary sequence in chromosome then GG will also pair with CC and that can also form a cytosine dimer .... so if only in given sequence then 1 dimer and if this sequence + its complimentary then 2 dimers one from thymine pair and one from cytosine pair

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