PLEASE PROVIDE A FULL EXPLANATION AND HOW YOU GET TO THE ANSWER! A snapdragon wi
ID: 49131 • Letter: P
Question
PLEASE PROVIDE A FULL EXPLANATION AND HOW YOU GET TO THE ANSWER!
A snapdragon with pink petals, black anthers and long stems was allowed to self-fertilize. From the resulting seeds, 650 adult plants were obtained. The phenotypes of these offspring were:
78 red long tan
26 red short tan
44 red long black
15 red short black
39 pink long tan
13 pink short tan
204 pink long black
68 pink short black
5 white long tan
2 white short tan
117 white long black
39 white short black.
Based on this information, what is the approximate map distance between the two linked genes?
9.1
11.3
16.9
18.2
22.4
33.8
9.1
11.3
16.9
18.2
22.4
33.8
Explanation / Answer
petal colour: pink, red, white
stem length: long, short
anther colour: black, tan
parental genotype: pink petals, black anthers and long stems = RRBBLL *RRBBLL
parental genotype in the offspring: 204 pink long black (RRBBLL) and 117 white long black (rrLLBB)
double crossover: 5 white long tan (rrLLbb) and 2 white short tan (rrllbb).
so the gene sequence: R - L -B
distance between R and L=37.3 cM
distance between L and B=56.1 cM
distance between R and B= 41.8
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.