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
What grade did you get in biology?

Characteristics of Thin Gingiva  Highly scalloped soft tissue and bony architecture  Delicate friable soft tissue  Minimal amount of attached gingiva  Thin underlying

Q Comparing toxicity and the need for dilution in water how different are the uricotelic and ureotelic excretions? What are some examples of animals that present these respective t

can u show the different activities on the topic

Define Nutritional Management of Eating Disorders? In the last unit, we focused on weight management. It is important to understand that the problems associated with too much d

The bar-tailed godwit, Limosa lapponica baueri, or kuaka, is a wading shorebird seen on marshy estuaries and wetlands during the New Zealand summer. Populations of this species emb

Bacillary Dysentery   You have learnt about the diarrhoea in the foregoing sub-section, now let us take for example a child who has loose motion which contains blood and mucus

What does veterinary medicine have to do with physiology and biochemistry? A lot of Physiology will teach about the function of animals and their parts. This is very significan

Q. Describe the rationale behind sterilization? Rationale for sterilization: Source of potential infection that exists in dental office include hands, saliva, nasal secretion,

Q. What are carcinogens? The Carcinogens are factors capable of producing neoplasias and any mutagen, a substance that can induce DNA mutation, is a potential carcinogen. Insta