11. Which of the following is the unit of inheritance ?
12. Allele is the
A. Alternate trait of gene pair
B. Total number of genes for a trait
C. Total number of chromosomes
D. Total number of chromosomes of a haploid set.
Answer : Option A
13. Types of phenotypes of F2 generation of dihybrid cross ?
14. Cross XXYy ? xxYy yields Xx YY:XxYy :Xxyy:xxyy offspring in the ratio of
15. Genes do not occur in pairs in
16. Genotype - Phenotype concept was first produced by
17. 1: 1: 1: 1 ratio shows
A. Monohybrid cross
B. Dihybrid cross
C. Back cross
D. Dihybrid test cross
Answer : Option D
19. In a plant, gene "T" is responsible for tallness and its recessive allele "t" for dwarfness and "R" is reponsible for red colour flower and its recessive allele "r" of white flower colour. A tall and red flowered plant with genotype TtRr crossed with dwarf and red flowered ttRr. What is the percentage of dwarf - white flowered offspring of above cross ?
20. In Mirabilis plant the appearance of the pink hybrid (Rr) between cross of a red (RR) and white (rr) flower parent indicates