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Explain the coevolution between figs and wasp pollinators. Why might wasps lay female-biased sex ratios? How should (and does) the sex ratio change if the fig is colonized by many vs one foundress?

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Jarrod Robel
Jarrod RobelLv2
28 Sep 2019

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Related questions

) A metallic blue-colored Indian blue peahen with long pinion feathers is crossed with a dull brown-colored Indian blue peacock with short pinion feathers. Half of the resulting peacocks are metallic blue with short pinions and half the resulting peacocks are metallic blue with long pinions. Half of the resulting peahens are dull brown with short pinions and half the peahens are dull brown with long pinions. Long pinions are the result of a functional protein. A) Which gene is sex-linked? B) What are the genotypes of each parent and each type of offspring?

Sorry for the long question but I was told two different ways to this. Which one is correct

First way

Genotypes for parents -

A metallic blue-colored Indian blue peahen with long pinion feathers = BbLl (BL, Bl, bL, bl)

Dull brown-colored Indian blue peacock with short pinion feathers = bbll (bl, bl, bl, bl)

BL

Bl

bL

bl

bl

BLbl

BbLl

Blbl

Bbll

bLbl

bbLl

blbl

bbll

Genotypes for offspring =

Metallic blue with long pionion feathers = BbLl

Metallic blue with short pioion feathers = Bbll

Dull brown with long pionion feathers = bbLl

Dull brown with with short pioion feathers = bbll

Should you include if it is a peahen or peacock?

No genes are sex-linked. It follows Mendel’s Law of Independent Assortment, which says “that separate genes for separate traits are passed independently of one another from parents to offspring.”

Second way - if this is correct how do you do the punnett table and which gene is sex linked.

Another way I was told to do this is

Bull brown (B) is dominant over blue (b)

Long pinion (L) is dominant ove short (l)

Genotypes for parents -

A metallic blue-colored Indian blue peahen with long pinion feathers = xbxb, Ll

Dull brown-colored Indian blue peacock with short pinion feathers = xby, ll

Peahen xbxb, Ll

Peacock xby, ll

Determine whether either of the genes are sex-linked. For this type of a question, if you aren’t told, then the thing for which to look is whether when looking only at the offspring one of the phenotypes sorts out by sex. NOTE: if you are dealing with a species that doesn’t have sex chromosomes (e.g. bees, wasps, most reptiles), you can’t have a sex-linked trait. Are birds reptiles or mammals?

Thank you Please do punnett table and explain what is sex linked gene if the second way is correct. Sorry again for the long post.

Please explain, and no hand-written work please, please type answer

Sex-Linked Traits (traits located on the sex chromosomes—usually the X chromosome)

Follow the directions for the lab. Enter data you obtain for the following crosses and answer questions on this answer sheet. (NOTE: The traits used in this Module 3 Lab are sex-linked. Therefore, you CANNOT click the “ignore sex” button for these crosses. You need to see separate results for males and females to analyze data for sex-linked traits.)

Question: In this lab exercise, should you click the "ignore sex" button for the crosses?

1. a. Perform a monohybrid cross between a female fly with a tan body and a wild-type male fly. Show results for the F1 offspring. (NOTE: You will use these F1 flies in the next cross.)
ENTER DATA HERE:

Question: Are the phenotypes of the F1 offspring what you would have predicted for this cross: why or why not?

Question: Each F1 female received a tan allele from her mother and a wild allele from her father. Why do all of the F1 females show the wild-type phenotype?

Question: Compare the number and type (X or Y) of sex chromosomes found in female and male flies.

Question: Compare the number of alleles present on the X and Y chromosomes.

Question: How can you tell that tan body is a sex-linked trait?

Question: How can you tell whether tan body is located on the X chromosome or the Y chromosome?

Question: If tan body was located on the Y-chromosome, what would be the phenotype of all the male F1 offspring? Is this what you obtained for the cross above?

Question: If tan body was located on the Y-chromosome, could females even show the trait? (HINT: When analyzing the cross results, remember that Y-linked traits are passed down only from affected males to their sons. Females cannot display Y-linked traits since they do not have Y chromosomes. On the other hand, both males and females can inherit X-linked traits since they both have X chromosomes.)

PUNNETT SQUARE:

List the genotypes of the parent flies in this cross (HINT: You must use X and Y symbols):

List the gametes produced by each parent fly in this cross:

Show the Punnett Square for the above cross.

1. If you had a fruitfly with phenotype A, what test would you make to determine if it was Aa or AA? Explain the different outcomes expected if the fly in question is AA or Aa.

2.The sex of birds, some insects, and other organisms is determined by a ZW chromosomal arrangement in which the males have like sex chromosomes (ZZ) and females are ZW (similar to XY in humans). Assume that a recessive lethal allele on the Z chromosome causes death of an embryo in birds. What sex ratio would result in the offspring if a cross were made between a male heterozygous for the lethal allele and a normal female?

3.A recessive gene for red-green color blindness is located on the X chromosome in humans. Assume that a woman with normal vision (her father is color-blind) marries a color-blind male. What is the likelihood that this couple's first son will be color-blind?

4. One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that they will have a daughter with hemophilia? (Note: In this problem, you must include the probability of having a daughter in your computation of the final probability.)

5. One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that their first son will have hemophilia?

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