Biology- phenotypes and genotypes?

Question

HELP! Please explain:

A greenhouse manager raising sweet peas notices that, unlike the plants she has had in other years, some of the flowers this year are white. In previous years, the pea flowers have been purple. What explanation would account for this difference in the plants? Include the possible phenotypes and genotypes of both parents and the offspring in your explanation.

Answer 1

sorry man but i cant help much but there is a thing that is called a punett square by using it you can get phenotypes and genotypes of offsprings

Answer 2

First of all...phenotype - measurable/visible appearance

genotype- genetic make up

let's use letter V for Violet and small v for white.

each gene (for example VV) is at least 2 alleles ("pieces":V+V or V+v etc). Each gene is "built" of one dominant allele (big V) and at least one recessive allele (small v), but there can be two recessive alleles (v+v) or two dominant alleles (V+V).

if the parents were Violet that means they had genes looking like that VV or Vv (the dominant V will show as Violet flower even though the recessive trait is white). If some of the offspring was white, that means that the recessive white gene (v) was passed to the next generation as dominant. How? If you take 2 parents -to have white flower offspring they must be Violet (V) but white for recessive allele (v), otherwise the offspring wouldn't be white. So if you put the equation as Vv + Vv that means there's 1/4 chance of the offspring to be white. SO...both of your parent plants were violet, but recessive for white (genotype of each=Vv) to be in power of having 1 out of 4 white "baby" flowers (genotype v v). Other possibilities of baby flowers would be 1 x VV (violet), 2 x Vv (violet, but white recessive) and of course that 1x v v (white) I mentioned before. Good luck!

Oh, and btw...to understand the equation I did for you just break down genes for both parents (Vv + Vv) into pieces: two V's, and two small v's and add them together... V from the 1st parent + V from the 2nd parent would equal 1VV. The V from 1st parent + v from 2nd parent = Vv. Big V from 2nd parent and v from 1st one= Vv. They would equal 2 x Vv. And the last combination is v from 1st parent and v from 2nd= 1v v. You got 4 possibilities out of 4 which equals 1 (4/4=1)

Answer 3

Phenotype is the physical result (i.e What is seen)

The dominant gene is seen in the product that is the capital Letter

Genotype is the Genetic make-up the person - their Alleles (i.e Aa or AA or aa)

Answer 4

Re-doing Gregor Mendals experiments? Below is the link that will put it together for you.