Given the above information.... 1. Draw the predicted Punnett square for the tra

Question

Given the above information....

1. Draw the predicted Punnett square for the trait in question based on the hypothesis mode of heredity

2. What would the expected number of White and Tan Jackalopes be in the population if they were in dominant-recessive mode?

3. Using the Chi-squared test, can you come to a conclusion if this trait follows the classical Mendelian mode of Heredity? Show your work and explain your conclusion.

Problem Set 1 PART B PUNNETT SQUARE AND X-SQUARE You are working on gathering data on the color variation on a new species of mammals, called the Jackalope. It comes in two color morphs: white and tan. After a long successful season in the field you gathered the following data from a population in Arizona: White -732. Tan 294 Since this is a new discovery it is unclear the mode of heredity of this color variation, but it is believed to be due to a gene on chromosome 5, following a dominant-recessive mode of heredity. The alleles for the gene is designated J and j. Using your data, use a statistical test if your population supports the hypothesis

Explanation / Answer

A new species of mammal,Jackalope has two color morphs, white and tan. It is beleieved that the gene for color is present in chromosome 5 and follows dominant-recessive mode of heridity.

1) The predicted Punnett square for the trait in question is given below,

The alleles for the trait is dsignated as J and j

Therefore, mating between white (JJ) and tan (jj) in F1 generation produces

F1 generation produces offsprings which are all heterozygous for white (Jj).

The F2 generation is shown below,

The phenotypic ratio of white and tan in F2 generation is 3:1

The genotypic ratio of JJ:Jj:jj in F2 generation is 1:2:1

2) The expected number of white and tan Jackalopes in the population if they follow dominant-recessive mode of Mendelian inheritance is in the ratio of 3:1. The expected number of white and tan Jackalopes are 770 and 256 respectively.

3) The chi-squared test can be done as below,

The white and tan jackalopes are 732 and 294 in number.

Therefore, total number of Jackalopes are 1026.

The Chi-squared value is 7.51.

The degree of freedom is calculated by the formula, (number of rows - 1) x (number of columns - 1).

Here, the degree of freedom is, (2-1) x (2-1) = 1

Considering the significance level at 0.05 and degree of freedom as 1, the value from chi-squared distribution table is 3.841.

Our test statistic (7.51) exceeded the chi-squared statistic (3.841).

So, the null hypothesis is rejected.

Therefore, the color trait in the Jackalope follows the classical Mendelian mode of heridity.

Gametes J J j Jj Jj j Jj Jj

Related Questions

Navigate

• Browse (All)
• Browse G
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.