Question

3. You have been playing craps at Las Vegas and suspect that the dice are loaded. You decide to perform an experiment using a single die to determine how many times out of 100 die rolls you roll a "1", and to use a chi square table to confirm your results. What would the DEGREES OF FREEDOM value be equal to? A) 1 B) 2 C) 3 5 D) 4 E) 5 F) 6 4. A pure-breeding female fruit fly with a yellow body and curly wings is crossed to a pure-breeding male fruit fly with a gray body and straight wings. All the offspring have curly wings but only female offspring from the cross have gray bodies and all males have yellow bodies. Body color is likely a(n)_ trait, and the gray allele is Wing shape is is likely a(n) _trait, and the curly allele is A) Autosomal; dominant; X-linked; dominant B) Autosomal; recessive; X-linked; recessive C) X-linked; dominant; Autosomal; dominant D) X-linked; recessive; Autosomal; recessive C curly, c straight, X9 = yellow, XG = gray. Female was CCX9X9, male was ccXGY. 5. Genes A and B are on different chromosomes. A dihybrid with the genotype AaBb undergoes meiosis. Which of the following depicts a possible genotype in a gamete? A. Aa B Bb C. AB D A E AaBb

The solutions are given, but could you please help me by providing the steps to get to the answer. I would like to be able to understand the way to get to the answers given. Thank you! Please show as much work as possible so I can follow along. Thank you!

Answer 1

3.

Degree of freedom = n - 1

n is the number of groups or types you are studying.

In this case you are performing the experiment on dice to check how many times out of 100, number 1 is appearing. In dice there are 6 numbers, 1, 2, 3, 4, 5, 6. So you have 6 types or groups. So degree of freedom will be 5.

4.

In the cross we see that when we cross curly winged females and straight winged males, all progenies have curl wings. It means it is an independent trait because it is occuring in males and females, all progenies and all progenies have curled wings. It means curled wings are dominant over straight wings.

Yellow body female and gray body males when crossed gave gray body females and yellow body males. The colour of the body is occuring in a sex dependent manner, so it is X linked trait. This is a dominant trait (gray dominant to yellow), thats why we see the reverse of colour in progenies as compared to parent.

In the last blue line, the genotypes are given. According to them gray is dominant to yellow and curly to straight. You can even cross check by drawing crosses.

5.

A gamete will contain one allele from each gene. AaBb is having 2 genes, A locus and B locus. A locus is having 2 alleles, A and a. B locus is having 2 alleles B and b.

So gametes will be -

AB

Ab

aB

ab

Please rate.