In a plant, long stems (L) are dominant to short stems (l). A true-breeding long
ID: 100718 • Letter: I
Question
In a plant, long stems (L) are dominant to short stems (l). A true-breeding long stemmed plant is crossed with a true-breeding short stemmed plant. Answer the following questions about the cross. Use the letters L and/or l. (10 points)
A. Using the letters L and/or l, what are the genotypes for the parents?
Long stem parent: __________ Short stem parent: __________
B. What are the parental gametes?
Long stem parent gives: __________ Short stem parent gives: __________
C. Draw a Punnett square for the parental cross (P generation cross):
D. What is the F1 genotype ratio? Give the numbers and what the genotype(s) are.
E. What is the F1 phenotype ratio? Give the numbers and what the phenotype(s) are.
F. Cross two F1 offspring together. Draw a Punnett square for this cross.
G. What is the F2 genotype ratio? Give the numbers and what the genotype(s) are.
H. What is the F2 phenotype ratio? Give the numbers and what the phenotype(s) are.
Explanation / Answer
Answer:
a). Long stem parent: __LL____ Short stem parent: _____ll_____
b). Long stem parent gives: ____L______ Short stem parent gives: ___l_______
c).
l
L
Ll (long stemmed plant)
d). All F1progeny will have same genotypes, Ll
e). All the F1 progeny phenotype is Long stem
F).
Ll x Ll
L
l
L
LL (long stem)
Ll (long stem)
l
Ll (long stem)
ll (short stem)
G). Phenotypic ratio of F2 generation:
Long stem (3) : Short stem (1) = 3 : 1
H). Genotypic ratio of F2 generation: 1 : 2 : 1
l
L
Ll (long stemmed plant)
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