Monohybrid cross

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Monohybrid cross

  1. 1. Monohybrid Cross A monohybrid cross is a cross between two individuals differing in one character pair.
  2. 2. Parents
  3. 3. Parents F 1 Generation
  4. 4. F1 Plant is self pollinated to produce the F2 Generation.
  5. 5. F 2
  6. 6. <ul><li>T T </li></ul>t t Tall Plant Dwarf Plant Parents
  7. 7. <ul><li>T T </li></ul>t t Tall Plant Dwarf Plant Parents Gametes T t
  8. 8. <ul><li>T T </li></ul>t t Tall Plant Dwarf Plant T t Parents Gametes F 1 Generation T t
  9. 9. <ul><li>T T </li></ul>t t Tall Plant Dwarf Plant T t Parents Gametes F 1 Generation Tall Plant T t
  10. 10. <ul><li>T t </li></ul>T t Tall Plant Tall Plant F1 Plant is self pollinated to produce the F2 Generation.
  11. 11. <ul><li>T t </li></ul>T t Tall Plant Tall Plant Gametes T t T t
  12. 12. T t Tall Plant Tall Plant Gametes F 2 Generation T t T t T t t t T T
  13. 13. <ul><li>T t </li></ul>T t Tall Plant Tall Plant Gametes F 2 Generation F 2 Phenotypic ratio is 3 : 1 F 2 Genotypic ratio is 1 : 2 : 1 T t T t t t T t T t T T t t T T
  14. 14. <ul><li>Factor </li></ul><ul><li>Mendel used the term factor to describe a hereditary unit. According to Mendel, each character is controlled by a pair of factors </li></ul><ul><li>Alleles </li></ul><ul><li>Alleles are two or more alternate forms of a single gene. </li></ul><ul><li>Dominant allele </li></ul><ul><li>The allele which is expressed in a hybrid. </li></ul><ul><li>Recessive allele </li></ul><ul><li>The allele which remains hidden in a hybrid. </li></ul><ul><li>Homozygous </li></ul><ul><li>It is the condition with two identical alleles of a gene. </li></ul><ul><li>Heterozygous </li></ul><ul><li>It is the condition with two different alleles of a gene. </li></ul>
  15. 15. <ul><li>Gamete </li></ul><ul><li>Egg or sperm which has only one allele of each gene and half the number of chromosomes (haploid) </li></ul><ul><li>Genotype </li></ul><ul><li>It is the specific genetic constitution of an organism. </li></ul><ul><li>Phenotype </li></ul><ul><li>It is the external expression of a genotype. </li></ul><ul><li>Monohybrid cross </li></ul><ul><li>Cross of two parents differing in one character pair. </li></ul><ul><li>Offspring </li></ul><ul><li>Offspring or progeny are the children from sexual mating. </li></ul><ul><li>F 1 </li></ul><ul><li>The first filial generation. </li></ul>

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