In a pea plant, the trait of flowers bearing purple colour (PP) is dominant over white colour (pp).
Explain the inheritance pattern of F1 and F2 generations with the help of a cross following the rules of inheritance of traits.
State the visible characters of F1and F2 progenies.
Answers
Explanation:
The crossing between two plants and inheritance of single contrasting trait is studied by monohdrid cross.
Mendel crossed two pure plants that is purple and white .
purple. * white
parents PP. * pp
gametes. P. P. * p. p
f1-generation Pp. Pp. Pp. Pp
phenotype =1:1
genotype =1:1
All the plants in f1prigeny were purple.The white is not lost but only supressed by dominant.
Mendel called supressed trait as ressecieve trait and expressed trait as dominant trait.
on self crossing in f1progeny :
Purple. * purple
f1-progeny Pp. Pp
gametes. P. p. P. p
f2-progeny Pp. Pp. Pp. pp
phenotype =3:1
genotype =1:2:1
In F2-progeny three plants are purple and one white plant
The white trait reappears in f2-progeny because the genes responsible for white reunits in f2-progeny.
The F1 generation is a result of cross between parents whereas F2 generation is the interbreeding between F1 progenies.
In F1 generation all progeny are purple.
In F2 generation 3:1 ratio of physical characters as 3 purple and 1 white.
Explanation:
The F1 generation of pea plant flower colour is shown as a cross between the purple colour and white colour.
The first filial generation has the progeny resulting from parents that are homozygous for either recessive or dominant allele. The resultant progeny are heterozygous for the trait and have dominant traits.
In F1 generation segregation of gametes takes place and gets express in cross independently.
PP X pp
p p
P Pp Pp
P Pp Pp 4:0 The phenotype in F1 generation is all tall progeny.
In F2 generation the cross between two progeny is shown in the punnet square. F2 generation is interbreeding of progeny that is heterozygous.
P p
P PP Pp
p Pp pp in F2 generation phenotype ratio is 3:1, genotype ratio 1:2:1
The visible character is phenotype so in F1 generation all progeny are tall and in F2 generation 75% progeny are purple while 25% are white colour flower.
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