6 th 3, wo mutations are observed in E. qinae, a tropical dart frog. The recessi

Question

6 th 3, wo mutations are observed in E. qinae, a tropical dart frog. The recessive allele, b, makes blue that gives normal toe length and the recessive allele, t, causes the toes to be shorter. You heterozygous females to homozygous recessive males and obtain 1,600 progeny. cond gene has a dominant allele, T, Phenotype Blue spots, short toes Blue spots, normal toes Red spots, short toes (8 # Progeny b ce n spots.norma Red spots, normal toes 1,600 BT Which of the progeny from the cross are recombinant (state the phenotypes)? Without calculating a recombination frequency, how did you identify the recombinant progeny? a. co b he Write the genotypeth FT heterozygote (as the genes would appearo chromosomes). Is the chromosome structure in cis/coupling or trans/repulsion? b. c. How many map units apart are the spot and toe genes? Show your work.

Explanation / Answer

a

b.

c.

Map distance = (No.of recombinant progenies / Total number of progenies ) x 100

Here

Map distance = (182+176/1600 ) x 100

= 22.38

Thus ,22.38 is the ,map distance between two genes (B and T).

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