Question

In: Biology

You are studying a plant whose seed shape (round, disc or elongated) and seed color (yellow,...

You are studying a plant whose seed shape (round, disc or elongated) and seed color (yellow, green grey) are determined by two different gene loci. The R/r locus controls seed shape and the Y/y locus control seed color. You have some data from single-trait crosses that were carried out by a friend of yours:

-Yellow and green seed plants each breed true when self crossed, but grey seed plants produce offspring of all 3 color seeds.

-Round seed crossed with elongated seed plants produce only disc shaped seed plants.

When two plants having the same phenotype of seed shape and color were crossed, the offspring appeared in the following proportions.

1/16 round yellow 1/8 disc yellow, 1/8 elongated grey,

1/16 elongated yellow 1/8 round grey, 1/8 disc green,

1⁄4 disc grey 1/16 round green, 1/16 elongated green

A) in your cross: what are the (i) genotype of the parents (ii) genotypes of the offspring and (iii) the phenotype of the parents? Draw a Punnett Square to show your answer.

B) what type of allele interaction is occurring for (i) seed shape? What about (ii) seed color? Explain how you can tell.

C) Based on the data from these crosses – is there any sort of epistatic interaction between the genes? Explain why or why not.

Expert Solution

A-

Genotype of parents is RrYy

Phenotype of parent - Grey and disc-shaped seed

Genotype of progenies -

1/16 round yellow - YYRR

1/8 disc yellow, - RrYY

1/8 elongated grey- rrYy

1/16 elongated yellow- rrYY

1/8 round grey, - RRYy

1/8 disc green, - Rryy

1?4 disc grey YyRr

1/16 round green, RRyy

1/16 elongated green rryy

B- Seed color is the case of incomplete dominance. As we can see that in heterozygous condition both the allele i.e. Y and y not able to show their phenotypes.

Seed Shape is the case of incomplete dominance. As we can see that in heterozygous condition both the allele i.e. R and r not able to show their phenotypes.

C- Epistasis is a condition in which one gene masks the phenotype of another gene. In our case when both the alleles are present they are showing the new phenotype. So in our case their is no epistasis between the genes

gladiator answered 1 year ago

Question 1 Yellow seed color is dominant to green seed color. A green seeded plant is...

Question 1 Yellow seed color is dominant to green seed color. A green seeded plant is crossed with a heterozygous plant. What phenotypic and genotypic ratios would you predict in the offspring? If I planted 200 of these offspring, how many would be green? How many would be yellow? Explain how you solved the problem.

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

You've discovered a new plant species in which yellow fruit color (Y) is dominant to green fruit color (y), and round fruit shape (R) is dominant to long fruit shape (r).

You've discovered a new plant species in which yellow fruit color (Y) is dominant to green fruit color (y), and round fruit shape (R) is dominant to long fruit shape (r). The genes for fruit color and shape are located on the same chromosome and are 12 m.u. apart. Determine the proportions of progeny of each phenotype produced for this cross. Yr/yR x yr/yr Reset Help 0% 6% 12% 25% 44% 50% 75% 88% 100% 1. yellow, round:25% 2. yellow,...

You are studying two new traits that control tomato color (red v. albino) and shape (round...

You are studying two new traits that control tomato color (red v. albino) and shape (round v. long). You cross a red and round tomato plant with one displaying albino and long. The resulting F1 are all red and round. The F2 have the following phenotypes (8 points) 834 round, red 250 round, albino 272 long, red 80 long, albino Which of these characteristics are dominant? What are the most likely genotypes of the F2? What is the mode of...

If homozygous green seed-producing plant is crossed to a homozygous yellow seed-producing plant, what percent of...

If homozygous green seed-producing plant is crossed to a homozygous yellow seed-producing plant, what percent of offspring produces yellow seeds? A) 10 B) 50 C) 33 D) 100 E) 25

Greg chose a yellow pea seed, the color of which is conferred by the Y allele....

Greg chose a yellow pea seed, the color of which is conferred by the Y allele. Y is completely dominant over the green y allele. He grew the yellow pea into a plant. In order to determine more about that plant's genotype, he performed a testcross of this plant with a green pea plant. He observed 92 green peas and 85 yellow peas among the testcross offspring. The conclusion he should make is: -the genotype of the yellow pea plant...

You are studying inheritance of various characters in marigolds including flower color (purple or blue), seed...

You are studying inheritance of various characters in marigolds including flower color (purple or blue), seed color (white or brown) and seed shape (round or oblong). When you cross a plant that is true breeding for blue flowers, white and oblong seeds with a plant that is true breeding for purple flowers, brown and round seeds you find that all of the offspring have blue flowers, and round, white seeds. You then cross these F1 plants with each other and...

3. Full pod shape (F) is dominant to constricted pod shape (f), yellow pod color (Y)...

3. Full pod shape (F) is dominant to constricted pod shape (f), yellow pod color (Y) is dominant to green pod color (y), and hairy stems (H) is dominant to hairless (h) in pea plants. The f, y & h genes are linked and reside upon the same chromosome. A pure-breeding green plant with full pods and hairy stems is crossed with a pure-breeding yellow plant with constricted pods and hairless stems. The genotypes of the parents are: A. YYFFHH...

2) Consider a hairy pea plant that was grown from yellow seed (an F1 hybrid). This...

2) Consider a hairy pea plant that was grown from yellow seed (an F1 hybrid). This hybrid had one parent (P1) that was an inbred variety with no hairs and was grown from a green seed. P2 was also an inbred variety, but grown from a yellow seed and had hairy leaves. After a backcross of the F1 hybrid to the P1 parent the following progeny are observed. Yellow seed/Smooth 29 Yellow seed /Hairy 82 Green seed /Smooth 9...

A plant breeding class scored the seed color and leaf morphology phenotypes of a dry pea...

A plant breeding class scored the seed color and leaf morphology phenotypes of a dry pea population. Seed color was scored based on its genotype (yellow vs. green vs. mixed) and leaf morphology by its phenotype (normal vs. tendrilled). Both traits are controlled by a single gene with complete dominance. The data they collected for leaf morphology were: 76 normal: 18 tendrilled and for seed color: 18 yellow: 24 green: 52 mixed. Combined phenotypes for these traits were 3 yellow,...