Fruit fly embryos known to be heterozygous for the cuticle mutants ebony body (e
ID: 65243 • Letter: F
Question
Fruit fly embryos known to be heterozygous for the cuticle mutants ebony body (e) and stubble bristles (sb) are given 50 rads of x-Rays to induce MITOTIC crossovers during their embryonic development. Mitotic crossovers were detected by observing mutant spots on the cuticle of the adult flies. Single ebony spots were observed and twin spots were observed. How are these loci arranges with respect to the centromere (a • represents the centromere) on the chromosomes of these flies?20. Fruit fly embryos known to be heterozygous for the cuticle mutants ebony body (e) and stubble bristles (sb) are given 50 rads of X-rays to induce MITOTIC crossovers during their embryonic development. Mitotic crossovers were detected by observing mutant spots on the cuticle of the adult flies. Single ebony spots were observed and twin spots were observed. How are these loci arranged with respect to the centromere (a represents the centromere) on the chromosomes of these flies)? sb sb sb sb d. a.
Explanation / Answer
The linkage between the non homologous chromosomes shows up new type of linkage relationships.
Translocations thus alter the size of chromosome and the position of the centromere.
In heterozygotes having two translocated chromosomes have more cytological and genetic effects.
a. metacentric
b.telocentric
d.acrocentric shorted its length to half
c. acrocentric
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