In a given species of plant, some have purple flowers and others have white flowers. A homozygous purple variety is cro...

Question

Question

In a given species of plant, some have purple flowers and others have white flowers. A homozygous purple variety is crossed w

science biology

Add a comment Improve this question Transcribed image text

Answer 1

Answer #1

Representation:

Purple: P = dominant= PP or Pp

White: p= recessive= pp

Cross: Homozygous purple x white:
PP xpp

	p	p
P	Pp	Pp
P	Pp	Pp

F1: All are Pp = Purple

Self fertilization:
Pp x Pp

	P	p
P	PP	Pp
p	Pp	pp

F2:

In general, if Mendel laws are followed or there is segregation and independent assortment:

Phenotype Ratio =3:1
Purple = 9/16 or ¾
White = 1/16 or ¼.

However in the stated scenario:

Phenotype Ratio =9:7
Purple = 9/16
White = 7/16

This indicates genetic interaction or epistasis.

Epistasis (I)- Interaction of non -allelic genes. This factor is influence by the influence of loci on the gene. This value will change, if a single locus controls a gene, or if there is interaction between multiple loci of the gene.

Phenotype value is designated as P (describing a trait or phenotype), genetic value or genotype by G, and E is environmental deviation (representing effect of environment and interaction of genotype with environment):

P = G + E

Phenotype variation VP = VG +VE

Genotypic value (G) further may be influenced by:

1. Breeding value (A)

2. Dominance deviation (D)

3. Epistasis (I)

Thus, phenotype variation:

VP= VA + VD + VI + VE

Add a comment

Answer 2

Similar Homework Help Questions

In an experiment, homozygous dominant plants with purple flowers were crossed with homozygous recessive plants with...

In an experiment, homozygous dominant plants with purple flowers were crossed with homozygous recessive plants with white flowers. Mendel collected the seeds from this cross, grew F1-generation plants, crossed them to form a second generation, and then analyzed the plants of the resulting F2 generation. What results did he probably get? 1/2 the F1 and 3/4 of the F2 generation flowers were white 1/2 the F1 and 1/4 of the F2 generation flowers were purple 3/4 of the F1 and...
A plant produces purple and white flowers. Purple is dominant to white. If we have a...

A plant produces purple and white flowers. Purple is dominant to white. If we have a homozygous dominant purple flower and a homozygous recessive flower, which of the following choices are correct? O purple; PP O white; Pp O purple; pp O white; PP A heterozygous individual with brown eyes has a child with a homozygous dominant individual with brown eyes. What are the chances they have a blue-eyed baby? (You can create a Punnet square on a scratch paper...
A red flowered plant is crossed with a white flowered plant. All of the F1 plants...

A red flowered plant is crossed with a white flowered plant. All of the F1 plants produce red flowers. When the F1 plants are allowed to self-pollinate, 389 of the F2 plants have red flowers and 141 have white flowers. What are the genotypes of the parental and F1 generation plants? A. P:Red = RR, white = rr; F1 = Red RR and Rr B. P:Red =Rr, white = rr; F1 = Red Rr and rr C. P: Red =...

The tralt for purple flowers in pea plants is dominant to the trait for white flowers...

The tralt for purple flowers in pea plants is dominant to the trait for white flowers (pl. FIGURE 18: Heterozygous Homozygous Recessive Cross P pp pPp pp 6. What is the probability that the heterozygous parent will donate a recessive p allele? 7. What is the probability that the homozygous-recessive parent will donate a recessive paliele? 8. What is the probability of both parents donating a recessive p allele? 9. Why is the known genotype in a testcross always homozygous...
In a different plant species, flower color is controlled by two genes that contribute equally to...

In a different plant species, flower color is controlled by two genes that contribute equally to the final flower color. Plants with red flowers have the genotype: CRCR DRDR, while plants with white flowers have the genotype: CWCW DWDW. A red flowering plant was mated to a white flowering plant and all of the F1progeny had pink flowers. These pink flowered F1 plants were allowed to self-fertilize to produce F2progeny. What is the genotype of the F1 plants that produced...
You have identified a new species of flowering plant with red flowers instead of the usual blue flowers. You performed a cross and found that all of the F1 plants had purple flowers. When you self-fer...

You have identified a new species of flowering plant with red flowers instead of the usual blue flowers. You performed a cross and found that all of the F1 plants had purple flowers. When you self-fertilized these F1 plants, the resulting F2 was: Blue flowers: 1034 Purple flowers: 297 Red flowers: 94 What would the expected numbers be if these phenotypes were due to two alleles with incomplete dominance at a single loci? What if these phenotypes were due to...

2. A Pea plant that is Homozygous Dominant for purple flower color and Heterozygous for dark...

2. A Pea plant that is Homozygous Dominant for purple flower color and Heterozygous for dark green leaves is crossed with another pea plant that is Heterozygous for both purple flower color and dark green leaves Let R = Purple flower color and r = white flower color Let D = Dark Green leaves and d = light green leaves Data Collection/Selection Using the information above, write the parent genotypes and gametes. Not all blanks may be used. Parent Genotypes:...
A variety of pure-breeding snapdragons produces a tall plant with green seeds (WWSS). A second variety...

A variety of pure-breeding snapdragons produces a tall plant with green seeds (WWSS). A second variety of pure-breeding snapdragons produce a short plant with white seeds (wwss). The two varieties are crossed, and the resulting seeds are collected. All of the seeds are green and when planted, they produce all tall plants (WwSs). These tall F1 plants are allowed to self-fertilize. The results for seeds and plant height in the F2 generations are as follows. What is the Х 2...
A variety of pure-breeding snapdragons produces a tall plant with green seeds (WWSS). A second variety...

A variety of pure-breeding snapdragons produces a tall plant with green seeds (WWSS). A second variety of pure-breeding snapdragons produce a short plant with white seeds (wwss). The two varieties are crossed, and the resulting seeds are collected. All of the seeds are green and when planted, they produce all tall plants (WwSs). These tall F1 plants are allowed to self-fertilize. The results for seeds and plant height in the F2 generations are as follows. What is the Х 2...

1. A plant with red flowers is crossed with a white-flowered plant of the same species....

1. A plant with red flowers is crossed with a white-flowered plant of the same species. All the seeds, when grown, produce plants with red flowers. Assuming that the flower color is controlled by a single pair of alleles, which allele is dominant and which is recessive? 2. How does inbreeding increase the incidence of recessive disorders in a population? 3. Why does an individual always have only two alleles for a given gene? 4. In cats, the allele (S) for short fur...

In a given species of plant, some have purple flowers and others have white flowers. A homozygous purple variety is cro...

Homework Answers

Add Answer to:
In a given species of plant, some have purple flowers and others have white flowers. A homozygous purple variety is cro...

Post as a guest

Earn Coins

In an experiment, homozygous dominant plants with purple flowers were crossed with homozygous recessive plants with...

A plant produces purple and white flowers. Purple is dominant to white. If we have a...

A red flowered plant is crossed with a white flowered plant. All of the F1 plants...

The tralt for purple flowers in pea plants is dominant to the trait for white flowers...

In a different plant species, flower color is controlled by two genes that contribute equally to...

You have identified a new species of flowering plant with red flowers instead of the usual blue flowers. You performed a cross and found that all of the F1 plants had purple flowers. When you self-fer...

2. A Pea plant that is Homozygous Dominant for purple flower color and Heterozygous for dark...

A variety of pure-breeding snapdragons produces a tall plant with green seeds (WWSS). A second variety...

A variety of pure-breeding snapdragons produces a tall plant with green seeds (WWSS). A second variety...

1. A plant with red flowers is crossed with a white-flowered plant of the same species....

In a given species of plant, some have purple flowers and others have white flowers. A homozygous purple variety is cro...

Homework Answers

Add Answer to: In a given species of plant, some have purple flowers and others have white flowers. A homozygous purple variety is cro...

Post as a guest

Earn Coins

Add Answer to:
In a given species of plant, some have purple flowers and others have white flowers. A homozygous purple variety is cro...