Question

Long Answers (32 marks)-Please include ALL your work for the problems you solve. 1. Prove that crossing overdoes not happen before the Sphase but happens at the four- chromatid stage? Draw a diagram (4 marks) 2. How do you calculate interference? What does it mean? (3 marks) 3. Map these loci and show all your steps. (6 marks) Loci Recomb. Frequency (%) Recomb. Frequency (%) a and f cand d cand e a and c cand f 50 a and d cand g 24 a and e

Answer 1

Answer:

Q-4):

Given interference value is megative ie -0.3), it means two genetic Tegions have move double Crossover than would be expected comesdering the crossover hale of each regions i Greato megative inference suggest Combined mab length of adjacent region was smaller or it means genes are linked. tighth Letus, Ebony-e, rough eye- brevis bristie - 6 G-wild-type) P- +++ A+++ X eberlebr fiy tat/ebr x ebrlebr . F2 is at 4t febr cbrlebr tbr /ets ext/ebr Herental Sco region In totoreby ebuleby 1. tbtlebr etrlebr - So region o DCO csiC 08 CC-CE 1-(-03) - 13 As the map distance is met provided, mot possible to calculate frequency of each phenohopes but one thing is clear from poor hver enestey than ! CCM imeans there is only Single 0903 ve mo dice,

Please Rate My Answer......Thank.......u...