Question

Synapsis occurs between
A. A male and female gamete
B. mRNA and ribosomes
C. Spindle fiber and centromere
D. Two homologous chromosomes

Answer 1

Hint: Synapsis is the process of the pairing of homologous chromosomes by crossing over. It occurs at the zygotene stage of meiosis. After synapsis, they exchange the chromosomal segment. This causes genetic recombination and variation in the gene pool of a particular population.

Complete answer:
Option A- A male and female gamete
Gametes are an organism's reproductive cells or sex cells. Female gametes are known as ova or egg cells, and male gametes are known as sperm. Gametes are haploid cells as each cell carries only one copy of each chromosome.

Option B- mRNA and ribosomes
There are three roles of RNA in protein synthesis. Messenger RNA (mRNA) is converted into protein by the joint action of transfer RNA (tRNA) and the ribosome. The ribosome is composed of numerous proteins and two major ribosomal RNA (rRNA) molecules.

Option C- Spindle fiber and centromere
The centromere refers to a specialized DNA sequence of a chromosome which links a pair of sister chromatids (a dyad). Spindle fibers attach to the centromere via the kinetochore during mitosis. Centromeres were first known as genetic loci that direct the behavior of chromosomes.

Option D- Two homologous chromosomes
A couple of homologous chromosomes are known as homologs. They are a set of one maternal and one paternal chromosome. They pair up with each other inside a cell during fertilization.

So, the correct answer is option D- Two homologous chromosomes.

Note:
Synapsis is a process occurring during meiosis. In this, the homologous chromosomes pair with their counterparts and remain bound due to the exchange of genetic information. They are then separated to reduce the genetic content of the resulting gamete cells. Synapsis results in a tetrad.