Kwashiorkor is a severe form of malnutrition primarily caused by: MCQ with Answer and Explanation

Explanation:
If two genes are completely linked, they are located very close together on the same chromosome and do not undergo independent assortment or crossing over. They are inherited together as a single unit. A dihybrid cross (RrYy x RrYy) with complete linkage behaves like a monohybrid cross. The F1 produces only parental gametes (RY and ry). The F2 generation will have a genotypic ratio of 1 RRYY : 2 RrYy : 1 rryy, resulting in a phenotypic ratio of 3:1.

Explanation:
The pancreas is a mixed gland (1). Alpha cells secrete glucagon, beta cells insulin. Thus, 2 and 3 are swapped and incorrect.

Explanation:
James Watson and Francis Crick, in 1953, proposed the double helix model of DNA based on X-ray diffraction data from Rosalind Franklin and Maurice Wilkins. Mendel discovered laws of heredity, Morgan linked genes to chromosomes, Beadle and Tatum proposed one gene-one enzyme, Hershey and Chase confirmed DNA as genetic material.