Female

Difference Between Male and Female Drosophila melanogaster

Difference Between Male and Female Drosophila melanogaster

The most simple characteristic to use to differentiate the two is to look at the genitalia of the flies. Males have dark, rounded genitalia at the tip of their abdomen, whereas females have light, pointed genitalia. ... Male Drosophila are generally smaller than their female counterparts, and have a darker abdomen.

  1. Why do female fruit flies have to be virgins?
  2. Why is there no crossing over in male Drosophila?
  3. What is the genotype of the female fruit fly?
  4. What are Virgin flies?
  5. What is the difference between male and female flies?
  6. What does it mean that a cell is 2N 8?
  7. Does crossing over occur in males and females?
  8. How many genetically distinct types of gametes are produced by a Drosophila male?
  9. Why do heterozygous females have red eyes?
  10. What is the genotype of a white-eyed female fruit fly?
  11. What is the genotype of a male fruit fly?

Why do female fruit flies have to be virgins?

Now we should collect virgin OK females. 7. IMPORTANCE OF VIRGIN FEMALES All female flies used in controlled genetic crosses must be “virgins”. Female flies are capable of mating as early as possible after emerging from the pupae stage and are polyandrous(capable of mating with several males).

Why is there no crossing over in male Drosophila?

One possible explanation for the lack of meiotic recombination in Drosophila males is that high levels of SNM might prevent recombination factors from acting. This can be addressed by expressing SNM in female germ cells and check effects on meiotic recombination.

What is the genotype of the female fruit fly?

Possible female genotypes

Since the female fly has a yellow body, and the tan body color is the dominant allele, she will be homozygous recessive for yellow body color. Therefore, the female fly will be homozygous for both traits. The genotype is Xw+y Xw+y.

What are Virgin flies?

Virgins fruit flies are physically distinctive from mature adults, making it easy to obtain virgin males and females for genetic crosses. ... Flies have a short generation time (10-12 days) and do well at room temperature.

What is the difference between male and female flies?

The most simple characteristic to use to differentiate the two is to look at the genitalia of the flies. Males have dark, rounded genitalia at the tip of their abdomen, whereas females have light, pointed genitalia. ... Male Drosophila are generally smaller than their female counterparts, and have a darker abdomen.

What does it mean that a cell is 2N 8?

A cell that contains both sets of. homologous chromosomes is diploid, meaning “two sets.” The diploid number of chromosomes is sometimes represented by the symbol 2N. For the fruit fly, the diploid number is 8, which can be written as 2N = 8, where N represents twice the number of chromosomes in a sperm or egg cell.

Does crossing over occur in males and females?

The data in table 2 allow us to conclude that crossing over between X and the long arm of the Y does occur in females but is either never seen or is suppressed in males. This conclusion is also supported by the data to be presented below.

How many genetically distinct types of gametes are produced by a Drosophila male?

4 types: 2 types.

Why do heterozygous females have red eyes?

Since the female parent is homozygous, whichever allele the males get, they will receive a red-eye allele. Females are red-eyed because the presence of the recessive copy is masked.

What is the genotype of a white-eyed female fruit fly?

Genotypes and phenotypes of offspring if the female is heterozygous. Half of the male and half of the female offspring of a heterozygous female would be white-eyed; the other half would be red-eyed. Therefore the female must be a heterozygous, Xw+ Xw.

What is the genotype of a male fruit fly?

The sex of the fruit fly Drosophila melanogaster is determined as follows: XX chromosomes give a female and XY give a male. The gene for bar eyes is recessive and located on the X chromosome. ... A male has a genotype RrTt.

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