Conclusions from the monohybrid crosses, Biology

Conclusions drawn from the Monohybrid Crosses

From the results of his monohybrid crosses, following conclusions were obtained :-

1 .       Law of Unit or Paired Factors (Postulate 1)

A character is represented in an organism (diploid) by at least two factors. The two factors lie on the two homologous chromosomes at the same locus. They may represent the same (homologous, e.g; TT in case of pure tall Pea plants) or alternate expression (heterozygous, e.g; Tt in case of hybrid tall Pea plants) of the same character. Factors representing the alternate or same form of a character are called alleles or allelomorphs.

2 .       Law of Dominance (Postulate 2)

It states, "When a pair of alleles or allelomorphs are brought together in F1 hybrid, then only one of them expresses itself, masking the expression of other completely."

e.g; In Tt-F1 hybrid

(tall)

Only 'T' expresses itself - so dominant and 't' is masked - so recessive.

3 .       Law of Segregation or Law of Purity of Gametes (Postulate 3)

It states that, "When a pair of alleles or allelomorphs are brought together in F1 hybrid, they remain together (coexist) without mixing or contaminating or blending with each other and separate complete during formation of gamete (gametogenesis)."

It is also known as 'Law of purity of gametes' because each gamete is pure in itself, i.e; having either T (i.e; factor for tallness) or t (i.e; factor for dwarfness).

Posted Date: 10/10/2012 3:52:54 AM | Location : United States







Related Discussions:- Conclusions from the monohybrid crosses, Assignment Help, Ask Question on Conclusions from the monohybrid crosses, Get Answer, Expert's Help, Conclusions from the monohybrid crosses Discussions

Write discussion on Conclusions from the monohybrid crosses
Your posts are moderated
Related Questions
Enzymes utilization in Brewing Industry Here, the main starting material is malt, produced by allowing barley seeds to germinate under moist conditions. The reserve starch is b

Q. Why are euglenas involved in polemics related to their taxonomic classification? Euglenas are involved in taxonomic polemics because they tend to be classified sometimes as

Define the Carbohydrate Utilization Pattern Test? Carbohydrates are composed of carbon, hydrogen and oxygen. These organic molecules are catabolized by large number of microorg

ADOLESCENC E  - It is the period of growth from the onset of puberty to the completion of growth & maturity. It extends between 12- 20 yrs. It is a period of rapid physical

Question 1 Explain how will you perform ward radiography? Question 2 Discuss the radiographic projections recommended for imaging the first to third cervical vertebr

Mechanical Prosthetic Valves :  These patients should have lifelong anticoagulation. In the absence of anticoagulation systemic embolism and strokes have been reported to be 5-50

what is its description and 3 most common example

What does ecological niche of an organism represent? Mention the scientific term used for modified form of reproduction in which seeds are produced without fusion of gametes.

what the by products of sugarcane

Major Criteria 1) Positive blood culture • Typical microorganism for infective endocarditis from two separate blood cultures Viridans streptococci, Streptococcus bovis, HAC