Question

In: Biology

1a) Bizarrely enough, male fruitfly spermatocytes do not undergo any crossing over (True fact!). Only female...

1a) Bizarrely enough, male fruitfly spermatocytes do not undergo any crossing over (True fact!). Only female oocytes are capable of recombination. Given this fact, If A and B are 42 map units apart on the same chromosome, and a male fly with AB and ab chromosomes mates with a female having AB and ab chromosomes, what will the genotypic offspring ratios be (2 points)? I understand that they must be linked because the recombination frequency is less than 50% here. -they are on the same chromosome.

1b) What will the phenotypic offspring ratios be, assuming A encodes apricot eyes, and is dominant to white eyes (a), and B encodes bristly legs, and is dominant to smooth legs (b)

1c) What will the genotypic ratios be if the female fly has chromosomes AB and aB, and the male has AB and ab chromosomes?

Expert Solution

Phenotypic ratio -

A_B_ = apricot bristly = 58.41

A_bb = apricot smooth = 16.59

aaB_ = white bristly = 16.59

aabb = white smooth = 8.41

C. Genotypic ratio -

AABB = 8.41

AABb = 6.09 + 6.09 = 12.18

AaBb = 6.09 + 6.09 = 12.18

AaBb = 8.41 + 8.41 + 4.41 + 4.41 = 25.64

AaBB = 6.09 + 6.09 = 12.18

aaBB = 4.41

AAbb = 4.41

aabb = 8.41

aaBb = 4.41 + 6.09 = 10.50

Please rate high.

gladiator answered 1 year ago

1a: What are the differences between male circumcision and female circumcision? 1b: What are the similarities...

1a: What are the differences between male circumcision and female circumcision? 1b: What are the similarities between male circumcision and female circumcision ? 1c: What double standards that we are overlooking when discussing these issues?

8. Assume that male and female births are equally likely and that the birth of any...

8. Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children. Suppose that 650 couples each have a baby; find the mean and standard deviation for the number of girls in the 650 babies. 9.A sales firm receives an average of four calls per hour on its toll-free number. For any given hour, find the probability that it will receive exactly five...

Which of the following statements is/are true regarding the biological distinction of male and female? Check...

Which of the following statements is/are true regarding the biological distinction of male and female? Check all that apply. Check All That Apply Only the male gamete is motile. The egg, or ovum, is unique to human females. The penis is the copulatory organ of the male. Human females lack a Y chromosome. Both ova and spermatazoa are considered gametes.

GAMETOGENESIS: Which of the following is TRUE of both male and female gametogenesis in humans? Group...

GAMETOGENESIS: Which of the following is TRUE of both male and female gametogenesis in humans? Group of answer choices a) Primary spermatocytes and primary oocytes are both diploid (2n) cell types. b) The divisions of meiosis happen completely within the gonads in both sexes. c) Meiosis II is completed after fertilization in both gametes d) Meiosis begins at puberty and continues throughout adulthood e) The first and second meiotic divisions are both equal (producing two cells of the same size)

Crossing over involves the physical exchange of DNA between chromatids. Group of answer choices True False

Do any of these sources undergo transformation processes when applied to the soil and before being...

Do any of these sources undergo transformation processes when applied to the soil and before being absorbed by plants? Does this affect the rate of uptake by plants? 5.9% nitrate nitrogen, 3.9% ammoniacal nitrogen, and 10.2% urea nitrogen.

You mate a male from a true-breeding strain of dwarf mice to a female from a...

You mate a male from a true-breeding strain of dwarf mice to a female from a true-breeding normal-sized strain. The F1 mice are all normal in size. What would the phenotypes of the F1 and F2 mice be in the reciprocal of the above cross if the dwarf character is caused by a mitochondrial genome defect?

A female fruit fly with singed bristles was mated with a male from a true-breeding wild-type...

A female fruit fly with singed bristles was mated with a male from a true-breeding wild-type stock with long bristles. All of the F1 females had wild-type long bristles and all of the F1 males had singed bristles. If the F1 flies are intercrossed, the expected ratio of long to singed bristles in the F2 flies is Multiple Choice 3:1 in both sexes. 3:1 in females, while all the males will have singed bristles. 1:1 in both sexes. 1:1 in...

Do male and female skiers differ in their tendency to use a ski helmet? Ruzic and...

Do male and female skiers differ in their tendency to use a ski helmet? Ruzic and Tudor (2011) report a study in which 710 skiers completed a survey about aspects of their skiing habits. Suppose the results from the question on the survey about ski helmet usage were as follows: Never Occasionally Always Male 243 71 180 Female 105 33 78 Part a) Which of the following null hypotheses could sensibly be tested by the data presented above? A. There...

A newspaper reports that the average expenditure on Easter is $100.89. Do male and female consumers...

A newspaper reports that the average expenditure on Easter is $100.89. Do male and female consumers differ in the amounts they spend? The average expenditure in a sample survey of 40 male consumers was $133.67, and the average expenditure in a sample survey of 30 female consumers was $65.64. Based on past surveys, the standard deviation for male consumers is assumed to be $45, and the standard deviation for female consumers is assumed to be $20. (a) What is the...