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Question
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
Solution
Meiosis is a type of cell division that reduces the chromosome number by half, necessitating the production of gametes for sexual reproduction. Gametes are haploid cells, which means that they contain half the number of chromosomes present in diploid cells (such as somatic cells). During fertilisation, the resulting zygote has the full diploid chromosome number when two gametes (sperm and egg) with half the chromosome number each fuse. Variation in the population is a result of the genetic diversity that is necessary for progeny to inherit a distinctive combination of genetic material from both parents.
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RELATED QUESTIONS
What is the number of chromosomes in the gametes of human beings?
Correct the following statement if there is any mistake:
Genes are specific sequences of bases on a chromosome .
Given below is a schematic diagram of a portion of DNA.
- How many strands are shown in the diagram?
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- Name the parts numbered 1, 2, 3, 4 and 5 respectively.
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Choose the best option out of the four alternatives a, b, c and d
Question 1:
The number of chromosomes in a certain type of cell division is halved. This kind of cell
division occurs in.
(a) Only testis
(b) Only ovary
(c) Both ovary and testis
(d) All body cells
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Choose the correct answer:
Chromosomes number is halved in ____________
Name the following:
Microtubules form the bipolar spindle in which stage.
Give Technical Terms
The stage when sister chromosomes separate from their paired condition.
Complete the following sentence with appropriate word :
The pairing of homologous chromosomes is called _______.
State the Location: Chromosomes
Complete the following sentence with appropriate word:
The chromosomal theory of inheritance was proposed by ____________in 1902.
In humans, the sex chromosome complement is
An inheritable change in the amount or the structure of a gene or a chromosome is called ______.
The sex of the newborn child is a matter of chance and neither of the parents may be considered responsible for it. What would be the possible fusion of gametes to determine the sex of the child?
Identify the TRUE statements with respect to aneuploidy.
- When the chromosome number is not the exact multiple of the haploid set, it is described as aneuploidy.
- Aneuploidy is only addition of one or more chromosome(s) to the total number of chromosomes in a cell.
- Aneuploidy is further classified as hypoploidy and hyperploidy.
Which of the following is TRUE with respect to the genes which inherit together during crossing over?
