Question

In the tobacco plant, the male gametes have 24 chromosomes. What is the number of chromosomes in the female gamete and what is the number of chromosomes in the zygote?
A. The number of chromosomes in the female gamete is 24, the number of chromosomes in the zygote is 48
B. The number of chromosomes in a female gamete is 20, the number of chromosomes in the zygote is 48
C. The number of chromosomes in a female gamete is 24, the number of chromosomes in the zygote is 40
D. The number of chromosomes in a female gamete is 20, the number of chromosomes in the zygote is 40

Answer 1

Hint: The number of chromosomes in male gamete and female gamete is the same and it is haploid in nature. The chromosome of the zygote s double than that of father or mother as it is diploid in nature. The sum of the chromosome of the father and mother is the chromosome number of the zygote.

Complete answer:The egg or female gamete cell is produced by the oogenesis process and the sperm or male gamete cell is produced by the spermatogenesis process.
After fertilization the zygote will form and have two sets of chromosomes, one set comes from each parent.
In a tobacco plant, there are 24 chromosomes present in a male gamete. It means the haploid number of chromosomes is 24 or n = 24.
As we know, an egg has also a haploid number of chromosomes, it means an egg has 24 number of chromosomes.
Thus, options B and D are eliminated.
The zygote has a 2n number of chromosomes.
Thus, the zygote will have 2*24 = 48 numbers of chromosomes.

Hence, the correct answer is option A. Number of chromosomes in the female gamete is 24, the number of chromosomes in the zygote is 48.

Note: Nicotiana tabacum, also known as cultivated tobacco, is an annually-grown herbaceous plant. It is found in cultivation, where it is the most commonly grown of all plants in the genus Nicotiana, and its leaves are grown in many countries to be processed into tobacco.