Meiosis is evolutionary significant because it results in
Important Questions on Cell Cycle and Cell Division
The following family tree traces the occurrence of a rare genetic disease. The filled symbols signify the individuals with the disease, whereas the open symbols signify healthy individuals.
Based on this information, the disease is most likely to be:
Assertion (A): The proportion of parental gene combinations was much lighter than non-parental type
Reason (R): Gene combination is due to linkage of the two genes
Give one significant difference between the following:
Linkage and crossing over
Given below are two statements one is labelled as: Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Mendel's law of independent assortments does not hold good for the genes that are located closely on the same chromosome.
Reason (R): Closely located genes assort independently.
In light of the above statements, choose the correct answer from the options given below:
| Column-I | Column–II | ||
| a. | Pachytene | (i) | The pairing of homologous chromosomes |
| b. | Metaphase I | (ii) | Terminalization of chiasmata |
| c. | Diakinesis | (iii) | Crossing-over takes place |
| d. | Zygotene | (iv) | Chromosomes align at the equatorial plate |
