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Paper Topic:

Genetics Lab report

INVESTIGATION OF MENDELLIAN GENETICS USING RAPID CYCLING BRASSICA RAPA

INTRODUCTION

Though it was long believed that offspring inherit their traits from their parents it was the wisdom and scientific nature of Gregor Johann Mendel that he gave a scientific theory to this belief . He was born in 1822 (www .accessexcellence .org ) and was an Austrian Augustinian priest His brilliant mind observed the pattern in the number in which the offspring share their traits with their parents and with his landmark work on inheritance of traits in pea plants he rose to become

the father of modern genetics . So great was his work that it required considerable time for the scientific community to appreciate his work and it was not fully recognized until the turn of 20th century Rediscovery of his work led to the foundation of genetics (wikipedia .com

Mendel worked on hybridization of pea plants . Hybridization is genetic mingling of organisms with distinct characteristics . It occurs when two distinct individuals with different characteristics are mated to each other . The offspring are referred as hybrids (Brooker 2005 ) To take an example cross pollination between pea plants with white flowers and those with blue flowers is an example of hybridization

In the present investigation Rapid Cycling Brassica Rapa (RcBr for short ) plants have been used . These plants were developed by Professor Emeritus Paul H . Williams , in the Department of Plant Pathology at the University of Wisconsin-Madison . During his early years working with RcBr plants , Williams (1989 ) discovered that these plants require very little attention and therefore were easy to grow . He bred these rapid cycling RcBr plants as a research tool to be used for improving disease resistance of cruciferous plants (a large group of plants that includes mustard , radish , cabbage , broccoli , kohlrabi and more . For speeding up the genetic research in the crucifers , he began breeding RcBr and six related species from the family Cruciferae for shorter life cycles . He succeeded in developing : petite , quick-growing plants known as Fast Plants (R (fastplants .org . He continued to select plants that had characteristics most suitable for laboratory and class room use , such as

Speed : Short time from planting to flowering (about 2 weeks rapid seed maturation with no seed dormancy required

Productive : Ability to produce seeds at higher planting density

Small : Petite plant size

Easy to grow : Ability to grow under continuous florescent lighting in a standard potting mix

His twenty years of work on planting , growing and selecting , reduced a six month life cycle to five weeks and refined the population of plants so they were relatively uniform in flowering time , size and growing conditions - but the remaining variation among the plants is what serves today as the launching point for investigations in classroom and research . The shortened life cycle has proven effective in reducing the time required for traditional breeding programs , which led to advances in cellular and molecular plant research

Today over 150 genetics traits have been described that are useful in research , many of which are used in...

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