What will produce a white flower with a red trim when a white flower is crossed with a red flower?

Question

a. codominance

b. dominance

c. incomplete dominance

d. mutation

Answer 1

its b. dominance

it will produce 25% pure dominant,50%heterozygous dominant,25% pure recessive

otherwise

in a,an intermediate will be produced

in c,both red and white shall be found in flower simultaneously as patches

in d.white flower character will be changed  to some other

so as u conclude white flower will be produced only in second case

Answer 2

The answer is a. codominance.  In codominance, both characteristics of different alleles are shown.  This can show up as spotting, stripes, or differenly colored center or edge.

If dominance, it would be either one color or the other, but not both (assuming only one gene controls the color of the entire flower).

If incomplete dominance, neither the red nor the white would be present - you would get a mixture of the two colors (pink).

A mutation just explains how different alleles come into existance.  Having a mutation might produce a codominant allele to one that already exists, but that's not a guarantee.

NOTE:  Another possibility exists that there is just one allele, the expression of which is due to environmental factors.  An example of this is the darker color of the ears, nose, tail, and paws (extremities) of the siamese cat.  Since these areas are farthest from the core of the body, their temperature is lower.  Body temperature determines the darkness of the fur color, with warmer areas developing a lighter color.

Answer 3

The restricted pigment pattern is either an affect of another gene that controls pigment distribution or an abiotic factor like temperature that affects the red pigment biosynthesis rate. Of the answers you have to choose from I would pick a mutation that restricts the pigment expression to the petal edge or a mutation in temperature sensitivity in pigment synthesis.

If the flowers coloration had been spotted with an evenly distributed color pattern across the flower it would be codominant genetic expression. Codominance does not control the location of the pigment. Therefore for the daughter plant to show a distinct and repeated restriction of the pigment to the margin of the petal implies this is not a result of normal genetic codominance between alleles. It is polygenic or under control of multiple genes.

Picotee is the term for this type of pigment patterning. It is a very complicated area of study in botany and different genera have differing polygenic traits to control this.

In irises one pattern type is controlled by the plicata gene. The plicata pattern is controlled by a single gene consisting of at least three alleles, Pl, pl and pla. The gene's mechanism is unknown but it may control the distribution of anthocyanin pigment or alter the pigment biosynthesis pathway regionally.

http://www.worldiris.com/public_html/lev...

Picotee coloration is often an extension of the eye coloration in daylilies and is a very desirable trait many breeders select for.

In some plants the picotee edge is only on the petals, like ‘Lady Betty Fretz’, in others its expression extends to the sepals also like ‘Puffer Fish’ and ‘Heavenly Pink Fang’

In some cases the picotee coloration bears no relation to the eye's color. See ‘Fortunes Dearest’ and ‘Face of the Stars’. But in most cases the edge color is the same as the eye. Even if the eye is bi-colored the edge will be bi-colored.

http://www.hartsdaylilies.com/genetics.h...

http://www.hartsdaylilies.com/Colors/flo...

Temperature and picotee edge appearance shows two genotypes in Chrysanthemums.

http://sciencelinks.jp/j-east/article/20...