MENDEL’S MONOHYBRID CROSS

JAYASREE P.S. M.Sc (zoo), M.Sc (psy) NET, M.Ed., M.Phil NETASSISTANT PROFESSOR IN Dr. MGR INSTITUTE OF SPECIAL

EDUCATION AND RESEARCH

MONOHYBRID CROSS

GREGOR JOHANN MENDEL (1822-1884)

GREGOR JOHANN MENDEL (1822-1884)

• Mendel was educated in a monastery and went on to study science and mathematics at the university of Vienna.

• Mendel blended his knowledge of science and mathematics and was the first one to keep count of individuals exhibiting a particular trait in each generation. This helped him to arrive at the laws of inheritance.

MENDEL’S MONOHYBRID CROSS

• Mendel selected tall and dwarf garden pea plants, Pisum sativum for the experiments.

DOMINANT AND RECESSIVE TRAITS

MENDEL’S MONOHYBRID CROSS

• He observed their growth for nearly two years and found that tall plants always produce tall plants and dwarf plants produce dwarf plants – generation after generation on self-pollination and under natural conditions.

MENDEL’S MONOHYBRID CROSS

He termed those tall and dwarf plants as wild types or pure breeding varieties.

MENDEL’S MONOHYBRID CROSS

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MENDEL’S MONOHYBRID CROSS

MONOHYBRID CROSS• He crossed a tall plant with a dwarf plant and observed

how the traits are transmitted the progeny and calculated the percentage of tallness and dwarfness in subsequent generations.

• When a pure breeding tall plant (TT) was crossed with a pure breeding dwarf plant (tt), all plants were tall in the first filial generation (F1).

• When such an F1 tall plant was allowed to self-pollination, both the tall and dwarf plants were appered in the second generation F2.

DIAGRAMMATIC REPRESENTATION OF MONOHYBRID CROSS

CHECKER BOARD

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The first experiment of Mendel considering the

inheritance of a single trait (Height of the

plant-Tall/Dwarf) is called monohybrid cross

ACTIVITYObserve the plants in your locality which

show different characters for the following traits. Count them and record your findings. Examples:

COCONUT TALL DWARF

Bean Violet Flower White flower

Sugarcane White Stem Purple Stem

THANK YOU