Drosophila melanogaster has one pair of sex chromosomes (XX or XY) a.pdf

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Drosophila melanogaster has one pair of sex chromosomes (XX or XY) and three pairs of autosomes, referred to as chromosomes II, III, and IV. A genetics student discovered a male fly with very short (sh) legs. Using this male, the student was able to establish a pure breeding stock of this mutant and found that it was recessive. She then incorporated the mutant into a stock containing the recessive gene black (b, body color located on chromosome II) and the recessive gene pink (p, eye color located on chromosome III). A female from the homozygous black, pink, short stock was then mated to a wild-type male. The F1 males of this cross were all wild type and were then backcrossed to the homozygous b, p, sh females. The F2 results appeared as shown in the following table. No other phenotypes were observed. Based on these results, the student was able to assign short to a linkage group (a chromosome). Which one was it? a. X chromosome b. chromosome II c. chromosome III d. chromosome IV Solution Image is not loading... upload the image in dropbox or google drive and paste the link in comment. I will answer the question.Categoryfemalesmaleswild6359122pink5865123black short5551106black pink short6960129.

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Gregor Mendel used pea plants to study heredity in a series of experiments. Mendel worked by carefully observing and recording traits in successive generations of plants. Knowledge about DNA and chromosomes came later. This lab will apply genetic laws to human inheritance using Punnett squares. Recall that DNA is wound tightly into chromosomes. Cells with only one set of chromosomes, such as sex cells, are haploid . When two haploid cells fuse during fertilization, a diploid zygote with two full sets of chromosomes is formed. Most cells of a mature individual are diploid. Homologous chromosomes have the same genes, but they might have different versions ( alleles ) of those genes. Diploid cells have two alleles for each gene. These alleles might be identical (gene A) or different (gene B). Each gene’s locus is its location on a chromosome. Human traits come through dominant or recessive inheritance. For example, the cystic fibrosis traits carried by a dominant allele are always expressed, even if the recessive gene is present (FF or Ff). The recessive is only expressed when two copies of the recessive allele are present (ff). Mother: Healthy carrier F f Father: Healthy carrier F FF Healthy non-carrier Ff Healthy carrier f Ff Healthy carrier FF Affected Human gender is carried on the X and Y chromosomes. Females are XX and males are XY. Heredity traits such as color blindness, which is the inability to distinguish among some colors, are carried on the X chromosome (X c ). The presence of one normal X C will allow normal vision. In this next set of exercises, you will determine the genotypes of the parents by considering the inheritance patterns of traits in their children. The following is a table of the phenotypes of the family members: Phenotype Alleles Parents Mother Not color blind Freckles Type B blood X c X C Ff I B i Father Color blind No freckles Type A blood X c Y Ff I A i Children Abby Color blind Freckles X c X c Ff or ff Brady Not color blind No freckles X C Y ff Carly Not color blind No freckles X c X C ff Dennis Color blind Freckles X c Y Ff or ff Exercise 1: Color Blindness Using the alleles XC (not color blind) and Xc (color blind), distribute the gametes from each parent to the outside of the Punnett square. Drag and drop the child with the correct phenotype to the box within the Punnett square that has the corresponding genotype that would occur from the fusion of egg and sperm as indicated by your placement of the gametes. Exercise 2: Freckles Freckles are groups of cells on the skin that produce the pigment melanin, often in response to exposure to ultraviolet (UV) light. The gene for freckles is inherited in a dominant/recessive pattern. A person carrying even a single copy of the dominant allele (F) will have freckles. A person who is homozygous recessive (ff) will have no freckles. Using the alleles F (freckles) and f (no freckles), distribute the gametes from each parent to the outside of the Punne.

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2. In Drosophila, a cross was made between females - all expressing the three X -linked recessive traits scute bristles (sc), sable body (s), and vermillion eyes (v) - and wile type males (P generation). In the F 1 , all femaleswere wild type, while all the males expressed all three mutant traits. The cross was carried to the F 2 generation, and 1000 offspring were counted, with the results shown in the following table. No determination of sex was made in the data. ( 8 points) (a) What are the genotypes of both the male and female parents in both the P and F 1 generations? (b) Determine the sequence of the three genes and the map distances between them. (c) Are there more or fewer double crossovers than expected? (d) Calculate the coefficient of coincidence. Does it represent positive or negative interference? .

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