Chapter 19 Heredity Lesson 1 - Monohybrid Cross and Test Cross

Lesson Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Heredity ,[object Object],[object Object],[object Object]

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Relationship between DNA, Chromosomes and Genes

Background information ,[object Object],[object Object],[object Object]

Monohybrid Cross ,[object Object],[object Object],[object Object],[object Object]

Mendel’s Insight into Patterns of Inheritance ,[object Object],[object Object],[object Object]

Terms to familiarise ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Examples: ,[object Object],[object Object],Phenotype Tall plant Pure-bred tall plant Homozygous tall plant Heterozygous tall plant Dwarf plant Genotype TT or Tt TT TT Tt tt

Can we determine the offspring of a genetic cross? ,[object Object],a A a aa A a A aa Aa A a a A aa Aa Aa A a a A aa Aa Aa AA A a female gametes 1. 2. 3. 4. male gametes

***Explaining Mendel’s Monohybrid Cross ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],purple x white TT x tt All Tt All purple T t T T t t Tt Tt Tt Tt T t Let T represent the alleles of the pea plant with purple flower. Let t represent the alleles of the pea plant with white flower.

***Explaining Mendel’s Monohybrid Cross ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],purple x purple Tt x Tt TT, Tt, Tt, tt purple, purple, purple, white 3:1 (purple:white) t t T t T t TT Tt tt Tt T T

Traits/ character Phenotypic ratio of 3:1 Condition : Only when the sampling size is large then will we obtain a phenotypic ratio of 3:1

Summary of Mendel’s monohybrid crosses

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],red x white TT x tt All Tt All red T t T T t t Tt Tt Tt Tt T t Let T represent the alleles of the hibiscus with red flower. Let t represent the alleles of the hibiscus with white flower.

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],red x red Tt x Tt TT, Tt, Tt, tt red, red, red, white 3:1 (red:white) t t T t T t TT Tt tt Tt T T

*** Testcross to figure out an unknown genotype

Chapter 19 Heredity Lesson 1 - Monohybrid Cross and Test Cross

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Chapter 19 Heredity Lesson 1 - Monohybrid Cross and Test Cross