(i) How many chromosomes will the cell have at the G1 phase, after S phase, and after M phase?
Does DNA replication occur in meiosis?
- 2 antipodal cell nuclei + 1 male gamete nucleus
- 2 polar nuclei + 1 synergid cell nucleus
- 2 polar nuclei + 1 male gamete nucleus
- 1 polar nucleus + 1 antipodal cell nucleus + 1 synergid cell nucleus
Does DNA replicate in both mitosis and meiosis?
What is the shortest phase of mitosis?
(i) All of the four cells are haploid
(ii) Two of the four cells are haploid and the other two are diploid
(iii) They are genetically identical
(iv) They are genetically dissimilar
- Only (i)
- Both (ii) and (iv)
- Both (i) and (iv)
- Both (i) and (ii)
- Reduction division
- Both a and b
- genes are present at different locations on the same cell
- genes are located on non-homologous chromosomes
- genes are located close to each other on the same chromosome
- genes are located far apart from each other on the same chromosome
How are trisomics classified?
- During mitosis
- During meiosis
- During fertilization
During embryo formation
- equational; reduction
- reduction; equational
- multiplication; reduction
- multiplication; equational
- It involves two cycles of DNA replication, one before meiosis-I and another before meiosis-II
- It involves crossing over that leads to recombination
- Sister chromatids separate during anaphase-II
- Nuclear membrane disappears during prophase
- Meiosis I
Write in brief about the exchange of genes between Homologous Chromosomes.
Find examples where the four daughter cells from meiosis are equal in size and where they are found unequal in size.
Reason: During meiosis II, the duplicated sister chromatids separate from each other and are distributed into the haploid daughter cells.
- Both the assertion and reason are true and the reason is the correct explanation of the assertion
- Both the assertion and reason are true but the reason is not the correct explanation for the assertion
- The assertion is true but the reason is false
- Both assertion and the reason are false
- diploid egg + diploid sperm --> haploid zygote --> mitosis --> haploid adult --> meiosis --> diploid gametes
diploid egg + diploid sperm --> haploid zygote --> meiosis --> haploid adult --> mitosis --> diploid gametes
haploid egg + haploid sperm --> diploid zygote --> mitosis --> diploid adult --> meiosis --> haploid gametes
haploid egg + haploid sperm --> diploid zygote --> meiosis --> diploid adult --> mitosis --> haploid gametes
- Crossing over does not occur
- Karyokinesis can not occur
- Chromosomes do not replicate
- Not all of the chromosomes can form homologous pairs
Which tissue of animals and plants exhibits meiosis?
- Separation of sex chromosomes
- Fresh DNA synthesis
- Separation of chromatids and centromere
- Separation of homologous chromosomes
Meiosis in diploid organisms results in
(a) production of gametes
(b) reduction in the number of chromosomes
(c) introduction of variation
(d) All of the above
Identify the wrong statement about meiosis
(a) Pairing of homologous chromosomes
(b) Four haploid cells are formed
(c) At the end of meiosis the number of chromosomes are reduced to half
(d) Two cycle of DNA replication occurs
- None of the above
- Reduction division
- Equal division
- Both reduction and equal division