Six chromatids of homologous chromosomes. The breakage and rejoining

Six
isoforms of 14-3-3 proteins in the extracts of mouse oocytes versus eggs are
detected by the western blot technique which is shown below in the picture. The
detection is done by 14-3-3 isoform-specific antibodies. The extracts of the
ovary and brain are kept as the positive controls. Separate genes encode the
14-3-3 proteins which are a family of homologous, conserved and ubiquitously
expressed proteins. There are six mammalian isoforms of the 14-3-3 protein
which are denoted by Greek letters as represented below.

1.       
Which of the following statements is not true regarding the
six 14-3-3 protein isoforms in mouse oocytes versus eggs mentioned in the
experiment?

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A)       All the six
isoforms of 14-3-3 proteins shown, are translated individually from different
mRNA transcripts in oocytes as well as eggs

B)       Amount of
14-3-3 ? appears to be greater in oocytes compared to eggs

C)       Amount of
14-3-3 ? appears to be lesser in oocytes compared to eggs

D)       Cellular
amounts of all the six 14-3-3 isoforms do not remain unchanged during
maturation of oocytes into eggs

DNA,
the genetic material is one of the most important types of biomolecules in all
eukaryotic cells. DNA is packaged within the nucleus as chromosomes.
Recombination occurs at the DNA strands in non-sister chromatids of homologous
chromosomes. The breakage and rejoining of the two DNA strands are involved in
the recombination process. This breakage and rejoining of the two DNA molecules
results in the formation of two re-arranged strands. This leads to the
introduction of genetic variations in a population.  The below process shows the process of
genetic recombination at a single recombination site between two such DNA
strands, M and F and two new sequences are generated by the formation of C1 and
C2 strands.  All sequences are represented
5′ to3′ direction.

9.         
In an experiment conducted to demonstrate the process of
recombination, which of the following would be highlighted as in vivo biological events resulting
recombination of genetic material?

A)       Synapsis and
crossing over in mitosis

B)       Synapsis and
crossing over in meiosis

C)       Synaptic
transmission

D)       Synaptonemal
complex