A female fruit fly with the genotype $b^+ cn^+ / b\ cn$ is testcrossed to a homozygous recessive male fly with the genotype $b\ cn / b\ cn$. The cross produces 455 wild-type, 445 black body with cinnabar eyes, 52 black body with normal eyes, and 48 cinnabar eyes with normal body offspring. Based on these experimental data, what is the genetic distance between the $b$ and $cn$ gene loci, and which biological process accounts for the recombinant offspring?

A) 5.0 cM, generated by independent assortment of non-homologous chromosomes during metaphase I

B) 10.0 cM, generated by spontaneous point mutations occurring during male gametogenesis

C) 20.0 cM, generated by chromosomal non-disjunction during anaphase II of meiosis

D) 10.0 cM, generated by crossing over between non-sister chromatids of homologous chromosomes during prophase I

Linked genes and recombination Transitional Reasoning Practice

Biology · Heredity · Biology · Non-Mendelian Genetics

1 Biology practice questions on Linked genes and recombination. Questions that build towards applied reasoning.

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Heredity · Biology

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