Explain each answer please Part A A B HG E D M N Fly 1 A B H G F E D M N Fly 2 a

Question

Explain each answer please

Part A A B HG E D M N Fly 1 A B H G F E D M N Fly 2 a b d ef g hmrn The drawings inside each box above represent homolgous chromosomes in two lines of fruit fly. The chromosomes are shown as they would appear in G1 phase cells. Fruit fly 1 is pure-breeding for dominant traits and fruit fly 2 is pure-breeding for recessive traits. Refer to this figure as you answer the questions in all parts of this problem. Which of the following statements concerning the relationship between the chromosomes in Fly l and Fly 2 is true? O The fly 1 chromosomes and the fly 2 chromosomes differ by a paracentric inversion. O The fly 1 chromosomes and the fly 2 chromosomes differ by a pericentric inversion. O The fly 1 chromosomes and the fly 2 chromosomes are unrelaed The fly 1 chromosomes and the fly 2 chromosomes differ by a duplication/deletion. The fly 1 chromosomes and the fly 2 chromosomes are the same except for the alleles

Explanation / Answer

1. The correct answer is The fly 1 chromosomes and fly 2 chromosomes are unrelated.
When there is a rearrangement of the normal order of genes in a chromosome is called the chromosomal inversion. These are of two types: pericentric inversion and paracentric inversion. Pericentric inversion involves the rearrangement of genes at both sides of the centromere whereas paracentric inversion does not involve centromere. In a paracentric inversion, a break occurs at the same arm only.

Here, both flies have different sets of genes, therefore, the chromosomes of the fly 1 and fly 2 are not related.

2. The correct answer is both (a) and (b) occur but not (c) and (d).
Unequal crossing over results in the gene duplication or deletion event. In unequal crossing over, a sequence gets deleted in one strand and replacing it with a duplication. In mitosis, sister chromatids while in meiosis, homologous chromosomes are involved.

Reciprocal translocation results from the recombination between repeated sequences present on non-homologous chromosomes.

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