may 669 d none of the above 33, When a crossover osours within the inversion loo

Question

may 669 d none of the above 33, When a crossover osours within the inversion loop of a pericennis inversion essh recombinant chromatid will have a a single centromere b, a duplication of one region. e a deletion different from the one of duplication d, all of the choices are correct. 34, For an organism to survive a deletion of more than a few genes, it must carry a nondeleted homolog of the deleted chromosome, This is known as a, a deletion heterozygote b. a deletion homozygote c, dosage compensation d. a triplolethal chromosome

Explanation / Answer

Answers: 33. (d) and 34 (a)

33. Option d. All of the choices are correct

Explanation: Pericentric inversion (which means around the centre) within the inversion loop includes single centromere (which means option a is correct).

Occurence of crossover inside the loop produces duplication or deletion products in which one or more loci have been duplicated or deleted(hene option b is correct).

The deletion product is different from the one of duplication (which implies that option c is also correct).

Thus, it is clear that all the options are true and correct answer is option (d) all of the choices are correct

34. Option a. a deletion heterozygote

Explanation: Homozygous deletion which are generally produced due to inbreeding are lethal and hence organism cannot survive in case of homozygous deletion. So, option b is wrong answer

Dosage compensation refers to the process by which organisms equalize the expression of genes between the members of different biological sexes. This is not related to the survival of organism and hence not the correct answer. So, option c is also wrong

Triplolethal chromosome causes lethality when present in either one or three copies in an otherwise diploid animal. So, option d is also wrong.

Deletion heterozygote has only half the norma dose of each gene by whcih organism can survive. So, the correct answer is option a

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