Question

Mendel crossed tall plant with dwarf plant in his famous experiment on he got only tall plants because

a- Parental plants were heterozygous

b- Soil was fertile

c- Parental plants were pure to their characters

D- Tallness was recessive

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Answer 1

Answer:

D is the correct answer

Explanation:

a) When Mendel crossed a true breeding tall plant (female parent) with a true breeding plant of the dwarf variety (male parent), he got tall plants like one parent in the first filial generation designated F

1

. He used the term “dominant” for the tall character which dominated in the F

1

. generation, and “recessive” for the character of dwarfness which remained hidden (latent) in the F generation. All plants are tall in F

1

.

b) Self-fertilization of the F

1

hybrids produced the second filial generation F

2

consisting of a total of 1064 plants of which 787 were tall and 277 were dwarf. That is tall and dwarf plants appeared in F

2

in the proportion of 2.84:1 which is roughly equal to 3:1. The percentage of dwarf plants is 25%.

c) In F1 generation TT X Tt will give offspring 50% TT and 50 % Tt. In F2 generation when They are again self-crossed, the gamets will be T from TT and T and t from Tt.

T T

T TT TT

t Tt Tt

So, the genotype will be 1:1 as 50% homozygous tall and 50% heterozygous tall.

Answer 2

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a- Parental plants were heterozygous