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Factors Affecting Plant Growth

What sizes of...

Question

What sizes of plants are produced if both parents have genes Tt?

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Solution

A cross between Tt x Tt parents can result in Tall(Tt, TT) and short plants(tt) progenies.
This is an example of a monohybrid cross and the phenotypic ratio is 3:1.

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(a) If a normal human cell has 46 chromosomes , how many chromosomes will be there in a human

(i) sperm cell,

(ii) zygote ?

(b) What sizes of plants are produced if both parents have genes Tt?

Q. A cross between two tall garden pea plants produced all tall plants. The possible genotypes of the parents are
I) TT, TT
II) TT, Tt
III) Tt, tt
IV) Tt, Tt

Q. What will be the percentage of gametes having recessive alleles for both the genes, if produced by a plant with genotype TtRr?

Q. The dwarf variety of garden pea plants are now known to have a mutation in a gene needed for synthesis of gibberellin.

F_{1}

plant obtained by Mendel from the tall (TT)

\times

dwarf (tt) cross were tall.
Which of the following inferences can be drawn from the given information?
(i) Gibberellin causes elongation of stems.
(ii) Heterozygous (Tt) plants produce the same amount of gibberellin as homozygous dominant (TT) plants.
(iii) Gibberellin induces production of auxin.
(iv) Mutation may have occurred in a gene producing an enzyme.

Q. What is the probability of gamete AbC produced by a plant having genotype AaBbCc (If all the genes are situated on different chromosomes)?

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Factors Affecting Plant Growth

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