Name: 18. A. In a plant, one gene determines flower color and an independently a
ID: 199982 • Letter: N
Question
Name: 18. A. In a plant, one gene determines flower color and an independently assorting gene determines the leaf shape. In this plant, the flowers are either red (R) or white (r) in color and the leaves are either long (L) or short (/). Determine the probability that a plant of the genotype R/r; 41 will be produced from parental plants of the following genotypes: R/rL/I and R/r:IA B. In another cross, involving parent plants of unknown genotype and phenotype, the following offspring were obtained. Determine the genotypes and phenotypes of the parents Offspring 3/8 red, long 3/8 red, short 1/8 white, long 1/8 white, shortExplanation / Answer
18A. RrLl X Rrll
Punnett Square:
Parent 1
RrLl
RL
Rl
rL
rl
Parent 2
Rrll
Rl
RRLl
RRll
RrLl
Rrll
Rl
RRLl
RRll
RrLl
Rrll
rl
RrLl
Rrll
rrLl
rrll
rl
RrLl
Rrll
rrLl
rrll
Four RrLI are produced in 16 offsprings
Probability of genotype RrLl = 4/16 (or1/4)
18B. Suppose the gene alleles for red/white are R (dominant, red) and r(recessive for white) and for long/short is L (dominant for long) and l (recessive for short)
Red long= RRLl or RrLl
Red, Short= RRll or Rrll
White, long= rrLL or rrLl
White short= rrll
Parent 1
RrLl
RL
Rl
rL
rl
Parent 2
Rrll
Rl
RRLl
Red, long
RRll
Red, short
RrLl
Red, long
Rrll
Red
short
Rl
RRLl
Red long
RRll
Red short
RrLl
Red Long
Rrll
Red short
rl
RrLl
Red
Long
Rrll
Red short
rrLl
white long
rrll
white short
rl
RrLl
Red
Long
Rrll
Red short
rrLl
white long
rrll
white short
Red long= 6/16=3/18
Red, Short= 6/16=3/8
White, long= 2/16=1/8
White short= 2/16=1/8
Parental Genotype= RrLl; Rrll
Parental Phenotype= red long and red short
Parent 1
RrLl
RL
Rl
rL
rl
Parent 2
Rrll
Rl
RRLl
RRll
RrLl
Rrll
Rl
RRLl
RRll
RrLl
Rrll
rl
RrLl
Rrll
rrLl
rrll
rl
RrLl
Rrll
rrLl
rrll
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