The medical condition where the lens of the eye becomes opaque is: MCQ with Answer and Explanation

Explanation:
Mature mammalian RBCs are anucleate, having lost their nucleus during maturation. This provides more space for hemoglobin, enhancing oxygen transport. The reason correctly explains the assertion. Nucleated RBCs are found in other vertebrates.

Explanation:
Mendel's first law (law of segregation) states that two alleles of a gene separate during gamete formation (meiosis) so that each gamete receives only one allele. This is due to the separation of homologous chromosomes in anaphase I of meiosis. Fertilization restores the diploid number. This law explains the 3:1 phenotypic ratio in monohybrid crosses. Mitosis maintains the allele pair.

Explanation:
Lysosomes are membrane-bound vesicles packed with hydrolytic enzymes (proteases, lipases, nucleases) that digest macromolecules, old organelles, and engulfed pathogens. They maintain an acidic pH (about 5.0) for optimal enzyme activity. Peroxisomes detoxify peroxides, mitochondria generate ATP, chloroplasts perform photosynthesis.