Question 4 Listen An organism has 8 pairs of chromosomes. How many possible gametes could it have (ignoring recombination). Assume each pair of homologues is heterozygous for at least one gene. a) 256 b) 16 c) 128 d) 8
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- Question #2: Recombination is a process that creates genetic diversity during meiosis. Below is the average amount of recombination (y-axis) in several species of eukaryotes (shown on the x). SAR=Stramenopiles-Alveolates-Rhizaria Eukaryote log recombination rate (cM/MI SAR fungi other animals unseg, worms insects www molluses fishes crustaceans amphibians + reptile DO aves mammals other plants gnoliids magnolii basal eudicots superrosids superasterids lilioids+alismatids commelinids conifers a) What do you notice about the amounts of recombination in the various species? b) This paper found that recombination is positively correlated with gene density (number of genes per kb of chromosome) and negatively correlated with the density of repetitive elements (areas of the genome that are repetitive and do not encode genes). Why might this be the case? c) A cross was made between two individuals (AaBbxAaBb) where A codes for red eyes, a codes for blue eyes, B codes for curly wings, and b…QUESTION 6 Assume that a researcher is studying coat color in voles. Three strains of white vole have been isolated: milky, blanc, and weiss. White is a recessive trait in each strain. Homozygous white voles are obtained for each strain. Consider the following crosses: milky X weiss = all white progeny (mutant) milky X blanc = all brown (wild-type vole color) blanc X weiss = all brown (wild-type vole color) The conclusion most consistent with these results is O A all three strains have mutations in the same gene. O B. all three strains have mutations in different genes. OC. milky and blanc have mutations on the same gene, weiss has a mutation in a different gene. D. milky and weiss have mutations on the same gene, blanc has a mutation in a different gene. O E. weiss and blanc have mutations on the same gene, milky has a mutation in a different gene.QUESTION 3 A cytogeneticist is studying the cells from an abnormal female monkey. In some cells, she finds that both X-chromosomes are active (i.e. not packaged into a Barr body), although one of the X-chromosomes appears shorter. She also finds that one of the autosomes are packaged as a Barr body, and she suspects that a translocation event might have been involved. By referring to the mechanism of X-chromosome inactivation, explain the observations made by the scientist.
- Question 9 Consider that a certain gene is a maternal effect gene and that the allele for dark brown pigment is incompletely dominant to the allele for no pigment (white). The incomplete dominant phenotype is light tan. If a heterozygous female is crossed with heterozygous male, what will be the phenotypic ratio of the progeny? A) 1 dark brown: 2 light brown: 1 white. B) 3 dark brown: 1 white C). all dark brown D) all light tan E) cannot be determined CS Scanned with CamScannerQUESTION 1. Plant A is 2n = 40, and plant B is 2n = 42. If crossed, they produce a hybrid plant. How many chromosomes are found in a somatic cell of the hybrid? a) 42 b) 82 c) either 40 or 42, depending on which plant was female d) 41 e) 40Question 9 Match the following with the term that best describes them Holds chromatids together in the middle ✓ DNA complexed with basic histone proteins ✓ Chromosome arrangement of the organism ✓ Noodle-like structures that appear clearly after prophase stage of mitosis A. karyotype B. chromatin C. chromosomes D. centromere
- question- Color blindness is inherited as a sex-linked recessive disease. A normal male marries a female who is heterozygous for the trait. What percentage of their sons will exhibit color blindness?Question 8.In a population of 235 individuals, it was observed that 200 were found to be (AA), 30 were found to be (Aa), & 5 were found to be (aa). A) Find the expected number of individuals for each of the genotypes observed. B) Conduct a X2analysis to determine if the alleles (A) & (a) are in Hardy-Weinberg equilibrium (use the probability chart below) Hint: use the chi square formula and the table belowQuestion 47 The supercoiled DNA can either be positively or negatively supercoiled. A) True B) False
- Question 7 Having the ability to degrade the DNA allows the DNA polymerase to perform its job properly and efficiently. A True B) FalseQuestion 5 Name three (3) structural features of the DNA and how they help the DNA perform its functions.Question 1: In tomatoes, round fruit (O) is dominant to oblong fruit (o). Write as much as possible of the genotypes of: (A) A plant from a homozygous round-fruited stock (B) A plant from an oblong strain (C) A round-fruited plant which resulted from a testcross (D) A oblong-fruited plant which resulted from the cross of two round-fruited ones.