For certain plants, height is controlled by one gene in a dominant/recessive man
ID: 257975 • Letter: F
Question
For certain plants, height is controlled by one gene in a dominant/recessive manner. The T allele produces tall plants, while the t allele produces dwarf plants. Similarly, the position of flowers is also a trait displaying complete dominance. The A allele produces flowers along the stalk (axis) of plants, whereas the a allele produces flowers at the ends of the stalks (terminus) of plants. These two genes are located on different chromosomes A. One parent plant is true-breeding for tall plants with flowers along the axis. The other parent is true-breeding for dwarf plants with terminal flowers. What are the genotypes of these two parents (2 points)? B. If the two parents above are bred, what will the genotype of the Fl generation of plants be (1 point)? C. What are the possible gamete types produced by an F1 plant (2 points)? D. Produce a Punnett square depicting the cross between two F1 plants (2 points): E. What proportion of the offspring will have each phenotype (Supplemental Credit, 2 points)?Explanation / Answer
Genotype of tall plant with axis flower -TTAA.
Genotype of drawf plant with terminal flower- ttaa.
Cross between them TTAA X ttaa
Gametes formed TA ta
F1 generation TtAa(tall plant with axis flower) X TtAa
Gametes formed TA, Ta, tA and ta TA, Ta, tA and ta
D) F2 geberation
A) Genotype of tall plant with axis flower -TTAA.
Genotype of drawf plant with terminal flower- ttaa.
B) The genotype of F1 generation - TtAa.
C) Possible gametes types produced by F1 plant - TA, Ta, tA and ta.
E) Proportion of offspring will will have each phenotype:
Tall plant with axis flower - 9.
Tall plant with terminal flower - 3.
Dwarf plant with axis flower - 3.
Dwarf plant with terminal flower - 1.
Male/Female TA Ta tA ta TA TTAA(tall plant with axis flower) TTAa(tall plant with axis flower) TtAA(tall plant with axis flower) TtAa(tall plant with axis flower) Ta TTAa(tall plant with axis flower) TTaa(tall plant with terminal flower) TtAa(tall plant with axis flower) Ttaa(tall plant with terminal flower) tA TtAA(tall plant with axis flower) TtAa(tall plant with axis flower) ttAA(dwarf plant with axis flower) ttAa(dwarf plant with axis flower) ta TtAa(tall plant with axis flower) Ttaa(tall plant with terminal flower) ttAa(dwarf plant with axis flower) ttaa(dwarf plant with terminal flower)Related Questions
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