n tomato plants, tall vine (D) is dominant over dwarf vine (d) and round fruit (O) is dominant over oval-shaped fruit (o). Two tall, round-fruit shape plants (plants 1 and 2) are crossed with dwarf, oval-shape fruit plants. The results are as follows: i)  Why is there a difference in the proportionate number of plants in each phenotypic class of the offspring resulting from test crosses of plants 1 and 2?   (ii)  Calculate the recombination frequency between the genes D/d and O/o in tomatoes.  (iii)  Draw a chromosome map for these genes. (Use underscore (_) to draw the line for the map)

Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter37: Plant Signals And Responses To The Environment
Section: Chapter Questions
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In tomato plants, tall vine (D) is dominant over dwarf vine (d) and round fruit (O) is dominant over oval-shaped fruit (o).

Two tall, round-fruit shape plants (plants 1 and 2) are crossed with dwarf, oval-shape fruit plants. The results are as follows:

i)  Why is there a difference in the proportionate number of plants in each phenotypic class of the offspring resulting from test crosses of plants 1 and 2?  

(ii)  Calculate the recombination frequency between the genes D/d and O/o in tomatoes. 

(iii)  Draw a chromosome map for these genes. (Use underscore (_) to draw the line for the map)

PLANT 1
PLANT 2
Tall, round x dwarf, oval-shape
Phenotypic classes
Tall, round
Dwarf, oval
Tall, oval
Dwarf, round
Total
Tall, round x dwarf, oval-shape
Phenotypic classes
Tall, round
Dwarf, oval
Tall, oval
Dwarf, round
Total
Numbers
Numbers
37
161
35
167
158
34
170
38
400
400
Transcribed Image Text:PLANT 1 PLANT 2 Tall, round x dwarf, oval-shape Phenotypic classes Tall, round Dwarf, oval Tall, oval Dwarf, round Total Tall, round x dwarf, oval-shape Phenotypic classes Tall, round Dwarf, oval Tall, oval Dwarf, round Total Numbers Numbers 37 161 35 167 158 34 170 38 400 400
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