i) What are the possible plhenotypes resulting from this \"e ec :50 .fother what
ID: 189592 • Letter: I
Question
i) What are the possible plhenotypes resulting from this "e ec :50 .fother what percentage of the offispring resulting from this cross will have atached iii) On average, nNeurly 50 years elapsed between Mendel's work in his garden and the rediscovery and replication of his findings in the early 1900s. Nearly another half-cent biology was evolutionary synthesis. Do you think such a time lag. from initial discovery to recognition within the field, could occur ury passed before Mendel's contributionto formalized, in combination with the forces of evolution, into what is known as the modern in science today? Why or why nor? 2) Are most phenotypic traits in humans Mendelian (discontinuous) or polygenic (continuous)? What might this tell us about the nature of human variation?Explanation / Answer
Part I- LAB discussion question
No, such a time lag from any initial finding and recognition within any field would not occur today.
There are several reasons for this and the foremost among all is the ease of sharing information wit people all over the time. During Mendel's time, the study of science was not so well organised and communication was not so easy. There were no international Science Journals where people could share their research and findings, let alone any other medium of Mass Communication.
With the 'miracle' that is Information Technology, the world has become a much smaller place. People can communicate with each other at the click of a button. Sharing knowledge has become much , much easier.
Added to all this, these days there are Science Conventions and Seminars at the International level where people can present their research papers and get immediate recognition. So' its a changed world now !
Mendel would have got International recognition in his lifetime and also a Nobel Prize for all his priceless work in Genetics if he had researched in these times.
2] Polygenic traits are controlled by multiple genes instead of just one. The genes that control them may be located near each other on the same chromosome or on separate chromosomes. Because multiple traits are involved so polygenic traits do not follow Mendelian pattern of inheritance. They are often represented as a range of continuous variation. Examples are height, skin colour, eye and hair colour etc.
Mendelian inheritance is involved when only one particular gene controls for a trait. If the gene is dominant, the trait will appear in the phenotype but if it is recessive, the trait will not appear in the phenotype. Some Mendelian traits in humans are- cleft chin, joint or separate earlobes, freckles or no freckles on the face.
Based on the above observations we can say that inheritance pattern in humans is both Mendelian and Polygenic. Human population is diverse . Although all human population contain 23 pairs of chromosomes, the genetic variation is immense. This is why we have so many human races spread all over the world. The human genome pool is very expansive. The phenotype does not only depend on the gene [ can be inherited] but also on the environment [ these will not be inherited] .
So, due to the different inheritance patterns ,we see such diverse phenotypic traits in humans.
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