Question 11
The number of chromosomes in parents and offsprings of a particular species remains constant due to

(a) doubling of chromosomes after zygote formation
(b) halving of chromosomes during gamete formation
(c) doubling of chromosomes after gamete formation
(d) halving of chromosomes after gamete formation

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Solution

(b) halving of chromosomes during gamete formation

The number of chromosomes in parents and offsprings of a particular species remains constant due to the halving of chromosomes during gamete formation.This process is known as meiosis.

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Q. The number of chromosomes in parents and offsprings of a particular species remains constant due to :
(a) doubling of chromosomes after zygote formation
(b) halving of chromosomes during gamete formation
(c) doubling of chromosomes after gamete formation
(d) halving of chromosomes after gamete formation

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In tobacco plant, the male gametes have twenty-four chromosomes. What is the number of chromosomes in the female gamete? What is the number of chromosomes in the zygote??

Q. Question 10
In human beings, the correct sequence of events during reproduction is

(a) gamete formation, fertilization, zygote, embryo
(b) embryo, zygote, fertilization, gamete formation
(c) fertilization, gamete formation, embryo, zygote
(d) gamete formation, fertilization, embryo, zygote

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(b) halving of chromosomes during gamete formation The number of chromosomes in parents and offsprings of a particular species remains constant due to the halving of chromosomes during gamete formation.This process is known as meiosis.

(b) halving of chromosomes during gamete formation

The number of chromosomes in parents and offsprings of a particular species remains constant due to the halving of chromosomes during gamete formation.This process is known as meiosis.