Chapter 5 proltlens 1. You develop an interest in the Mediterranean gecko (Hemid

Question

Chapter 5 proltlens 1. You develop an interest in the Mediterranean gecko (Hemidactylus turcicus) and establish a large breeding colony. In your crosses you notice that three single gene traits appear to linked. The traits you are interested in are as follows: Large eyes (E) are dominant to small eyes (e), nocturnal feeding (D) is dominant to daytime feeding (d), and purchases car insurance (ID is dominant to tendency to forgo insurance coverage (). In order to map these genes you cross individuals that are triple heterozygotes with individuals that are homozygotes for the recessive allele at all three genes. The number of each phenotype among the 1000 progeny of this cross is listed below. Use these data to answer the following questions. Phenotype Large eyes, nocturnal feeding, without car insurance D Large eyes, daytime feeding, with car insurance Large eyes, nocturnal feeding, with car insurance t OT Small eyes, nocturnal feeding, with car insurance Small eyes, daytime feeding, with car insurance c Large eyes, daytime feeding, without car insurance ; Small eyes, nocturnal feeding, without car insurance e D Small eyes, daytime feeding, without car insurance ; Offspring 3 DLO 56 SO 405 ( 37 Sco e. 4 DU0 23 SLo 54 5t0 418 What is the order of the three genes? What is the distance (in cM) between the genes? Sketch the chromosome and identify the location of the three genes and the distances between them.

Explanation / Answer

Answer.

Order of genes = EID

E------6.7cM--------I --------11.7 cM------------D

Heterozygous genotype= EID/eid

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