Question

The F2 generation from a dihybrid cross produced a total of 219 tall plants with purple...

The F2 generation from a dihybrid cross produced a total of 219 tall plants with purple flowers, 72 dwarf plants with purple flowers, 69 tall plants with pink flowers, and 31 dwarf plants with pink flowers.

1: please state your hypothesis and explain how you arrived at this prediction

2:

phenotype observe expected
Purple, tall
Purple, dwarf
Pink, tall
Pink, dwarf
total number of plants in F2 generation

3: What is the chi-square value between the observed and expected offspring from the F2 generation for this dihybrid cross? (2 mark) Please report your chi-square value with 3 decimal places .

(a) What is the degrees of freedom for this dihybrid cross? Blank 1 (1 mark)

(b) What is the probability associated with your calculated chi-square value for this dihybrid cross?

Blank 2 < P < Blank 3

HINT: Make sure you enter the numbers on the correct side of the less than (>) symbols.

Science   Biology   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

1. Null hypothesis: The observed values are not deviating from the expected ratio i.e. 9:3:3:1.

2. Test staic:

Category

purple tall

purple dwart

pink tall

pink dwarf

Total

Observed values

219

72

69

31

391

Exptected Ratio

9

3

3

1

16

Exprected Values

219.9375

73.3125

73.3125

24.4375

Deviation

-0.9375

-1.3125

-4.3125

6.5625

D^2

0.878906

1.722656

18.59766

43.06641

D^2/E

0.003996

0.023497

0.253676

1.762308

2.043478

X^2

2.043478

Degrees of freedom

4

-

1

3

3: The chi-square value between the observed and expected offspring from the F2 generation = 2.043

(a) What is the degrees of freedom for this dihybrid cross? = 4-1 = 3

(b) What is the probability associated with your calculated chi-square value for this dihybrid cross? 7.82 at 3 DF and 0.05 probability.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
1. Conduct a dihybrid cross of pea plants with the following combination of traits: Parent 1—Tall...
1. Conduct a dihybrid cross of pea plants with the following combination of traits: Parent 1—Tall plant with white flowers (pure breeding); Parent 2—Dwarf plant with purple flowers (pure breeding). i) What are the genotypes of the parents? ii) What are the genotypes of their gametes? iii) Portray a cross and determine the F1 generation. Use a Punnett’s square. What are the genotypes and phenotypes of their offspring? iv) Conduct a F2 cross with the offspring. What are the genotypes...
a) In radishes, the plants can be tall (allele T) or dwarf (allele t). Tall is...
a) In radishes, the plants can be tall (allele T) or dwarf (allele t). Tall is dominant. Root color can be red (allele RR), white (allele RW), or pink (heterozygote). A radish that is true-breeding for both red roots and tallness (RRRR TT) is crossed with a radish that is true-breeding for both white roots and being dwarf (RWRW tt). Write the genotype and phenotype for the F1 generation. b) Assume the two genes for plant height and root color...
Answer all 3 parts of the question. a) In radishes, the plants can be tall (allele...
Answer all 3 parts of the question. a) In radishes, the plants can be tall (allele T) or dwarf (allele t). Tall is dominant. Root color can be red (allele RR), white (allele RW), or pink (heterozygote). A radish that is true-breeding for both red roots and tallness (RRRR TT) is crossed with a radish that is true-breeding for both white roots and being dwarf (RWRW tt). Write the genotype and phenotype for the F1 generation. b) Assume the two...
1. You cross two homozygous parental pea plants. One has purple flowers and is tall, the...
1. You cross two homozygous parental pea plants. One has purple flowers and is tall, the other has white flowers and is short. All of the F1 plants are purple and short. What are the genotypes of the parents and the F1? If you were to cross the F1 generation, what genotypic and phenotypic ratio would you expect to see in the offspring?
An F2 flowerbed has a total of 929 plants. You observed/counted 705 red flowers and 224...
An F2 flowerbed has a total of 929 plants. You observed/counted 705 red flowers and 224 purple (in these flowers, red flower color is dominant to purple). Based on your knowledge of Mendelian genetics, what would be the genotype for both of the F1 parents that were crossed to produce these F2 plants (write a tentative hypothesis)? Test your hypothesis using chi square analysis and probability values. Remember, because only two traits are examined in this problem, the degrees of...
Corn #1 is a standard F2 generation of a monohybrid cross. The trait you will be...
Corn #1 is a standard F2 generation of a monohybrid cross. The trait you will be following here is the endosperm characteristic making the corn either starchy or sweet. The information in red was obtained by in the lab by counting how many are displaying each of the following phenotypes Number starchy(smooth) 232 Number sweet(wrinkled) 72 What is the expected ratio? Perform a chi square below. Determine your probability value ______ and analyze what that means.  
You perform a dihybrid cross in fruit flies using one dominant mutant (VanGogh, which has a...
You perform a dihybrid cross in fruit flies using one dominant mutant (VanGogh, which has a unique swirl in the wing bristle pattern) and one recessive mutant (sepia, which have bright red eyes instead of the typical brick red) and find the following results in the F2. Normal eyes, VanGogh wings - 1011; Normal eyes, normal wings - 334; sepia eyes, VanGogh wings - 359; sepia eyes, normal wings - 120. Calculate expected results based on the prediction that Mendel's...
You cross two individual striped mice multiple times. The resulting F1 generation offspring all have striped...
You cross two individual striped mice multiple times. The resulting F1 generation offspring all have striped coats. You cross F1 mice multiple times and observe the following phenotypes among the F2 offspring: 145 striped mice, 37 spotted mice, 13 mice with no patterns. From these observations you suspect that coat patterning is under the control of two bi-allelic genes experiencing dominant epistasis. Answer the questions below (Q 1-3) and use a Chi-square test to support or reject your hypothesis, then...
German abbot Gregor Mendel published his famous pea results in 1866, to what can be described...
German abbot Gregor Mendel published his famous pea results in 1866, to what can be described as a general shrug. Fast forward 35 year when two scientists, Hugo de Vries and Carl Correns, independently arrived to the same conclusions and rediscovered his work. This would catch the general attention and eventually redefined the fields of genetics, evolutionary biology, and population genetics. In 1904, William Bateson, Edith Saunders, and Reginald Punnett (of the Punnett square fame) published odd results: when selfing...
One common application for the chi-square test is a genetic cross. In this case, the statistical...
One common application for the chi-square test is a genetic cross. In this case, the statistical null hypothesis is that the observed results from the cross are the same as those expected, for example, the 3:1 ratio or 1:2:1 ratio for a Mendelian trait. Dr. William Cresko, a researcher at the University of Oregon, conducted several crosses between marine stickleback fish and freshwater stickleback fish. All marine stickleback fish have spines that protrude from the pelvis, which presumably serve as...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT