please answer this question related to SIR Mendel's genetics?

Question

In a cross between a plant with yellow cotyledons and a plant with green cotyledons,the offspring obtained is yellow cotyledonous.When this is crossed with a green cotyledonous plant,50 plants where obtained,among which approximately half of them are green cotyledonous.explain the principle involved.

thank you so much guys

Answer 1

The principle involved here is that of dominance of yellow cotyledon colour over Green colour.
Explanation follows:-

1) When yellow is crossed with green the offspring is all yellow.... This is because both of them are homozygous or pure for their coty. colour....

YYcrossed with yy = all Yy i.e. all of them are hybrid Yellow cotyledonous plants........(1).

2) When one of these hybrid yellow (Yy) is crossed with green (yy), the offspring is divided in to Yellow and green in the ratio 1:1......
Yy crossed yy = 50 % Yy (Yellow) and 50%yy
(green)...............................................(2).

This proves the law of dominance set forth by Mendel.

Answer 2

All genes comes in pair. One comes from the male and the other from the female. Let's write this as gg for the green cotyledonous and YY for the yellow cotyledonous. When these are crossed together the result is a Yg pair in all cases. The cotyledons are yellow because the «yellow gene» is dominant over the «green gene». The latter being called a recessive gene.
When Yg is crossed with gg, half the plants will be Yg and half will be gg. The latter are green and the former are yellow as said before. In fact it's not exactly the half because other phenomenas like mutations happen. It was proven by statistical method that Mendel had falsified his data for giving exactly the half and so prove his law.

Answer 3

This question can be answered by an understanding of the genes, or more accurately, the alleles involved. Alleles are genes that code for a specific trait, and the alleles here either code for yellow cotyledons or green cotyledons. The allele for yellow cotyledons is dominant, and the allele that codes for the green cotyledons is recessive. The plant with green cotyledons has two recessive alleles, and the plant with the yellow cotyledons has two dominant alleles. Their offspring would have one dominant allele and one recessive allele. The dominant allele would mask the recessive allele, therefore all of the offspring would express the dominant phenotype of having yellow cotyledons. When one of these offspring is crossed with a plant with green cotyledons, meaning it has two recessive alleles for the trait, half of the offspring have green cotyledons and half have yellow cotyledons. This is due to the fact that half of the offspring recieved the dominant allele coding for yellow cotyledons from the parent plant that had yellow cotyledons, and the other half recieved the recessive allele which that parent plant also has. All of the offspring recieved one recessive allele from the parent with green cotyledons. The offspring that recieved the dominant allele would express the dominant trait of yellow cotyledons and the offspring that recieved the recessive allele would express the recessive trait of green cotyledons.

Answer 4

I guess that means Yellow is Dominant, and green is recessive. So let Yellow be Y and let green be g

There are two genes for colour, one from the mommy plant and one from the daddy plant right? So you are either YY (fully yellow), Yg (part yellow and part green but show up as yellow cause yellow is dominant) or gg (fully green)

So far so good?

So for the first crossing...

YY + gg means you get Yg plants which are always yellow

The offspring is Yg (has genes for both but looks Yellow)

Then Yg is crossed with gg

For fertilisation, the one parent's gene is either Y or g and the other parent's gene is just g

So you'll get offspring that is either Yg (yellow) or gg (green)

50% chance of either because only those two combinations are possible. So you can have either Yellow or green. This would be easier to do if you could draw a chart.

Answer 5

Experiments on Plant Hybridization

Written in 1865 by Gregor Mendel, Experiments on Plant Hybridization was the result after years spent studying genetic traits in pea plants. Mendel read his paper to the Natural History Society of Brunn in Bohemia at the meetings held on February 8 and March 8 of that year. The paper was later published in Proceedings of the Natural History Society in 1866. In his paper, Mendel compared seven discrete characters: 1.Smoothness of the seeds. 2.Color of the seeds. 3.Color of the seed coats. 4.Shape of the pods. 5.Color of unripe pods. 6.Position of flowers. 7.Length of the stems.


the seven characters observed by Mendel. to Cross two strains, the flower of one is opened before self-polination takes place, the anthers are removed, and the ovules are dusted with polen from the other strain. the outsprings of such a cross are called f1 generation.
Through experimentation, Mendel discovered that one inheritable trait would invariably be dominant to its recessive alternative. This model, later known as Mendelian inheritance or Mendelian genetics, provided an alternative to blending inheritance, which was the prevailing theory at the time. Unfortunately, Mendel's work received little attention from the scientific community and was largely forgotten. It was not until the early 20th century that Mendel's work was rediscovered and his ideas used to help form the modern synthesis.

It is interesting to note that Mendel happened to choose a plant for which the traits were discrete. Had Mendel chosen a plant for which multiple genes are needed to express a trait, he may never have arrived at his genetic laws.

In the 1930s, the statistician R.A. Fisher pointed out that the near-accordance of Mendel's results with the predicted ratios were far too perfect to have likely had been actual experimental results. Some historians have attributed this to an over-eager assistant.

Answer 6

each little thing applies. you need to submit to in techniques that each and one and all ants (or bees or wasps) are offspring of the comparable mom (the queen). There might nicely be distinctive fathers, yet that relies upon on the species. Genetics regulations - there are no longer any exceptions. All ants, bees and wasps are sisters no remember the species, yet different generations matter on the greater youthful queen that leaves the nest to start a sparkling one, and which men happen to get to her. ALL lifeforms on earth Earth are genetically motivated - there is not any longer something as nicely genetics (that all of us comprehend of, on the planet.) Mendel began the genetics learn, in spite of the incontrovertible fact that it has surpassed him via incredibly plenty. Mendel only mentioned some pea flowers, yet genetics is plenty greater complicated than that. Mendel's findings are traditionally substantial, yet no longer definitive.

Answer 7

first generation offspring--phenotype all yellow

second generation offspring--half phenotype yellow, half phenotype green

first generation

Yel | Yel
-----------------------
Gre YG | YG
-----------------------
Yel YY | YY

if yellow is dominant over green, then all these offspring are yellow. In this case, one parent is Homozygous Yellow, and the other parent is Heterozygous Yellow.

Second generation, breed a Heterozygous Yellow with a Homozygous Green (the only way you'll get a green if green is recessive)

Yel | Gre
--------------------------
Gre YG | GG
-----------------------------
Gre YG | GG

so about half are Homozygous Green, and the other half are Heterozygous Yellow

hope it helps. Hope the Punnet squares come out in the posting.