Monohybrid

 

 

 

Studying Monohybrid Cross

 

1.1.            Goal

f   

 

f   

 

 

1.2.            Basic Theories.

 

Mendel’s Laws, principles of hereditary transmission of physical characteristics. They were formulated in 1865 by the Augustinian monk Gregor Johann Mendel. Experimenting with seven contrasting characteristics of pure-breeding garden peas, Mendel discovered that by crossing tall and dwarf parents, for example, he got hybrid offspring that resembled the tall parent rather than being a medium-height blend. To explain this he conceived of hereditary units, now called genes, which often expressed dominant or recessive characteristics. Formulating his first principle (the law of segregation), Mendel stated that genes normally occur in pairs in the ordinary body cells, but segregate in the formation of sex cells (eggs or sperm), each member of the pair becoming part of the separate sex cell. When egg and sperm unite, forming a gene pair, the dominant gene (tallness) masks the recessive gene (shortness).

Microsoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.

 

 

 

1.3.            Tools and Materials

a.        Tools

j  White buttons 200 pieces

j  Red buttons 200 pieces

j  Two glasses of jars

b.        Materials

b  ….

b  ….

b  ….

b  ….

 

1.4.            Working Procedure

1.     In each jars, put 100 red buttons and 100 white buttons. The two jars represent two individuals in F, generations in a experiment. Red buttons represent dominant allele for round pea seed (B) and white buttons for recessive wrinkled pea seed allele (b). Shake each jar to mix the buttons.

2.    Put your left hand to one jar and the right one to the other jar. Take a button from each jar at the same time randomly (avoid looking at the inside of the jar). Put the two buttons on the tables (they represent zygote). Record whether the result is red-red, red-white, or white-white buttons.

3.    Repeat this process 3 times.

 

 

Write down the working procedure explained by video in the column below !

 

 

 

 

 

 

 

 

 

 

 

1.5.            Attachment …

 

Note

 

f         Simbol GENOTIP B, FENOTIP Bulat

 

 

f         Simbol GENOTIP b, FENOTIP Kisut

 

 

 

 

 

f            Hasil Perkawinan

 

 

 

 

1.6.            Observation Result

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.7.            Questions

 

å  How the genotype ratio of the cross ?

 

 

 

 

å  How the phenotype ratio of the cross?

 

 

 

 

å  What conclusions can you draw from this experiment?