Technology of storage and primary processing of agricultural products

Table 11

Ota	Mother gametes
gametes	A 1 A 2	A 1 a 2	a 1 A 2	a 1 a 2
A 1 A 2	A 1 A 1 A 2 A 2	A 1 A 1 A 2 a 2	A 1 a 1 A 2 A 2	A 1 a 1 A 2 a 2
A 1 a 2	A 1 A 1 A 2 a 2	A 1 A 1 a 2 a 2	A 1 a 1 A 2 a 2	A 1 a 1 a 2 a 2
a 1 A 2	A 1 a 1 A 2 A 2	A 1 a 1 A 2 a 2	a 1 a 1 A 2 A 2	a 1 a 1 A 2 a 2
a 1 a 2	A 1 a 1 A 2 a 2	A 1 a 1 a 2 a 2	a 1 a 1 A 2 a 2	a 1 a 1 a 2 a 2

Development of wheat grain color under the influence of polymer genes. 
In F ₂ , phenotypic and genotypic separations are observed in the following ratios:
Phenotype: Genotype:
1 dark red A ₁ A ₁ A ₂ A ₂
4 red A ₁ A ₁ A ₂ -, A ₁ - A ₂ A ₂
6 light red A ₁ A ₁ - -, A ₁ - A ₂ -, - - A ₂ A ₂  
4 red A ₁ - - -, - - A ₂ -
white a ₁ a ₁ a ₂ a ₂
Thus, 5 phenotypic and 9 genotypic classes are formed in F ₂ .
Issues to be solved independently
1. Spring wheat mark occurs under the influence of two dominant polymer genes A1 and A2 winter wheat mark two recessive genes a1 and a2 . When these genes are homozygous in the genotype, the sign of spring and winter wheat is fully visible.
Determine the genotype and phenotype of the hybrid plants formed from the following hybrids .
a) A1A1A2A2 x a1a1a2a2
b) A1A1a2a2 x a1a1a2a2
v) A1a1a2a2 x a1a1A2a2
2. What is the difference in the sign of spring-winter wheat in the offspring when the following genotype plants pollinate themselves ? 
a) A1a1a2a2 b) A1a1A2a2
v) A1A1A2a2 g) a1a1A2A2
3. Two varieties of corn, 20 and 8 cm long, are mixed. If the 5 cm recessive gene of each dominant gene sota is 2 cm long, then 1) What is the length of the sota in F ₁ ? 2) How many of the 960 plants in F _{2 make up} the 3 dominant gene forms ?
4. The hairs in the micropile part of the cotton seed belonging to the genus Xirzutum belong to the dominant A1A1A2A2 genes. If there are 4 dominant genes in the genotype, the hair is normal, 3 is less than normal, 2 is intermediate, and 1 is very small. These genes do not develop hair in seeds that are in a recessive state. What will be the genotype and phenotype of hybrid forms in F ₁ and F _{2 if the} micropile part of the seed is mixed with hairy and hairless cotton varieties ? 1) How many of them have normal seed hair? 2) How many are hairless? 3) If F ₂ hybrids are re-mixed with hairless seed forms, how many phenotypic and genotypic forms are formed in F ₃ ?