When parents P1 and P2 are crossed, F1 progeny was produced with 3/4 similar features in
phenotype to P2 and F1 and 1/4 possessed contrasting traits. If the traits being considered
here are for height with T for tall and t for short. What will be the possible genotype of P1 and
1/4 of F2?
Answers
Answer:
Gametes
Tt (P
1
; tall)
Tt (P
2
; tall) T t
T TT
(tall) Tt
(tall)
t Tt
(tall)
tt
(dwarf)
According to the question, 3/4th progeny was similar to P
2
and F
1
. Since F
2
progeny has two types of phenotypes in 3:1 ratio; both parents should carry one recessive allele to pass it to the 25% recessive progeny. To have 3:1 phenotypic ratio, parent genotype should be "Tt" because both "TT" parents give all "Tt (long) offspring, both "tt" parents give all "tt" offspring but "Tt" parents produce offspring with 3:1 ratio. This makes option D wrong. As we know that F
1
hybrids are heterozygous; here the 1/4 F
2
has contrasting character to F
1
and therefore should be dwarf with genotype "tt". The Tt genotype of 1/4 F
2
make option A and C wrong.
Therefore, the correct answer is option B.
Answer:
Weathering is the breaking down of rocks, soils, and minerals as well as wood and artificial materials through contact with the Earth's atmosphere, water, and biological organisms.
Explanation:
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