In peas the flower color and pollen length genes are very close together on the same...

In peas the flower color and pollen length genes are very close together on the same chromosome. Purple flowers (P are dominant to white (p), and long pollen (L) is dominant to short pollen (l). A true breeding variety of peas with purple flowers and short pollen is crossed to a true breeding variety with white flowers and long pollen. The F1 plants are then self-crossed to produce an F2 generation.

a. What is the genotype and phenotype of the F1 generation?

b. What proportion of the F2 will have purple flowers with long pollen?

c. What proportion will have white flowers and short pollen?

Expert Solution

If the genes are closely linked to each other on a chromosome, recombination cannot occur between these genes.

the genotype of the peas with purple flowers and short pollen is PPll and genotype of true breeding variety with white flowers and long pollen is ppLL.

PPll * ppLL

Pl/pL (F1, all F1 plants have purple flowers and long pollen)

a) genotype of F1 is PpLl and phenotype of F1 is purple flowers and long pollen.

b) Pl/pL * Pl/pL

Pl/pL P and l allele is one chromosome and p and L alleles are on its homologous pair since these genes are closely linked to each other, Pl/pL can produce only two types of gametes Pl and pL.

	Pl	pL
Pl	PPll ( purple flowers and short pollen)	PpLl ( purple flowers and long pollen)
pL	PpLl ( purple flowers and long pollen)	ppLL ( white flowers and long pollen)

proportion of the F2 will have purple flowers with long pollen = number of plants with purple flowers and long pollen/total number of progeny=2/4=1/2

c) proportion will have white flowers and short pollen= number of plants with white flowers and short pollen/total number=0/4=0.

gladiator answered 1 year ago

in garden peas, genes controlling height, flower color, and seed size are on the third autosome...

in garden peas, genes controlling height, flower color, and seed size are on the third autosome gene map: height-----10 mu------- color-------------20mu------ seed size a purebred tall, red flowered, large-seeded plant is crossed with a purebred short, white flower, small seeded plant. All of the offspring are medium height, pink, and small seeded. A. What proportions of the pollen produced by the F1 will carry the tall, red flowered and large seed alleles? B. if the F1 is allowed to produce...

In pegasus genetics, horn length, feather color, and tail length genes are located on the same...

In pegasus genetics, horn length, feather color, and tail length genes are located on the same chromosome. Each gene has two alleles: wild type, which is dominant, or mutant, which is recessive. H is dominant and results in long horns; h is recessive and produces short horns. F is dominant and results in rainbow feathers; f is recessive and produces white feathers. T is dominant and results in a long tail; t is recessive and produces a...

Flower color in buffalo clover is either white or some shade of pink to red. Pollen...

Flower color in buffalo clover is either white or some shade of pink to red. Pollen from a red individual was applied to white flowers in 1999. This seed was germinated in 2000 and four red plants were obtained in the progeny. These four red plants were allowed to self pollinate in summer 2000 to produce the next generation. Populations of progeny from each of the four plants were grown in the greenhouse in spring 2001 and the following data...

In Mendel's pea plants, the genes that code for flower color, seed color and seed shape...

In Mendel's pea plants, the genes that code for flower color, seed color and seed shape are on 3 different chromosomes. For flower color, purple is dominant over white, yellow seeds are dominant over green and round seeds are dominant over wrinkled seeds. If you crossed two parents who were heterozygous for all 3 genes, how many purple flowered, round and yellow seeded plants would you expect in the offspring generation? correct answer is 27/64 please show work thank you

Suppose two genes determine shape and color of peas. Gene G codes for color and G...

Suppose two genes determine shape and color of peas. Gene G codes for color and G is dominant. A pea that is GG or Gg is green, a pea that is gg is yellow. The gene R codes for shape. A pea that is RR or Rr is round, a pea that is rr is oval. If we cross two peas that are Gg and Rr we expect the following distribution of peas: (9/16) are green and round, (3/16) are...

You are studying three linked genes in snapdragons. The flower color locus is in the center....

You are studying three linked genes in snapdragons. The flower color locus is in the center. There are 11.3 cM between the flower color locus and the plant height locus. There are 10.7 cM between the flower color locus and the leaf type locus. The coefficient of coincidence is 0.8. Pure-breeding tall, red-flowered plants with fuzzy leaves were crossed to pure-breeding dwarf, blue-flowered plants with smooth leaves. The F1 were testcrossed. Calculate the proportion of the testcross progeny that are...

Task- genetics The genes for body color (A), eye color (B) and wing length (C) are...

Task- genetics The genes for body color (A), eye color (B) and wing length (C) are linked to the same autosomal chromosome of D. melanogaster, in the order of A - B - C. For body color, alleles encode 'A +' for wild type and 'a' for black body; for eye color, alleles encode 'B +' for wild type and 'b' for pink eyes; For wing length, alleles code 'C +' for wild type and 'c' for short wings. Wild-type...

Flower color in Orcish Thimbleweed (Anemone sarumani) is controlled by two genes. At the G locus,...

Flower color in Orcish Thimbleweed (Anemone sarumani) is controlled by two genes. At the G locus, red flowers (G) is dominant to slate gray (g). At the W locus, colored flowers (W) is dominant to colorless (w). Plants with the genotype G-W- are red, ggW- are slate gray, and --ww are white. A true-breeding plant with red flowers is crossed with a true-breeding plant with white flowers, producing F1 offspring with slate gray flowers. What is the expected phenotypic ratio...

Assume that flower color in petunia is controlled by two genes. After making a dihybrid cross,...

Assume that flower color in petunia is controlled by two genes. After making a dihybrid cross, the following progeny were observed: 9 purple-flowered petunia : 7 white-flowerd petunias a) What form of epistasis is working to control this trait? b) One of the heterozygous individuals used in the above dihybrid cross was test-crossed. What phenotypic classes do you expect in the progeny and at what frequencies? Show your work/thought process.

In the common bluebell, two linked, autosomal genes control flower color and plant height. With the...

In the common bluebell, two linked, autosomal genes control flower color and plant height. With the given information, find the expected F1 generation phenotypes and the frequencies of the F1 generation. B (blue flowers) is dominant to b (white flowers) T (tall plants) is dominant to t (dwarf plants) If the crossover frequency between the two loci is 26%, what will the expected F1 phenotypes and their frequencies from the following cross: a) BT//bt x bt//bt b) Bt//bT x bt//bt...

Question