What other organelle has its own genes? These are extranuclear genes.Although you inherited one chromosome of each pair from your mother and your father, you have inherited a group of genes from your mother only. What genes are these?A female is a carrier for color blindness & mates a male with normal vision. What is the probability that they have a son who is color blind?The notions for wild type & mutant traits follows some accepted conventions. Notate the following genotypes for a female fruit fly. a. fly with homozygous for red eyesb. fly with heterozygous for red eyesc. fly with homozygous for white eyesWhen Thomas Hunt Morgan mated a white-eyed male fly with a red-eyed female, he came to the startling conclusion that the trait for eye color was located on the chromosome that determines sex. Show this cross by going through the three generations.Just a few years ago, biologist & medical personnel were surprised to learn that fetal cells can escape & enter the mother's blood. How can these cells be used in fetal testing?Use the figure below, which is from Figure 15.10. It shows the results of a cross between a fruit fly that is heterozygous for a gray body with normal wings, and a fruit fly that has a black body with vestigial wings. Because these genes are linked, the results are not what might have been predicted. Show the phenotypes and number of each type of offspring. Indicate which offspring are there combinants and which are the parental type. Finally, calculate the map distance between the two genes. Show all your work here.Review meiosis. When does crossing over occur?A number of genes will cause a variation in phenotype, depending on whether the gene came from the father or the mother. This variation occurs because of genomic imprinting. Explain genomic imprinting.If a man with type AB blood mates with a woman with type O blood, what blood types would you expect in the children?a. What is the F2 phenotypic ratio? ___________________ , genotypic ratio? _____________b. Which generation is completely heterozygous? ________c. Which generation has both heterozygous & homozygous offspring? _________Explain what is meant when a gene is said to have multiple alleles. Blood groups are an excellent human example of this.What is the probability that a couple will have a girl, a boy, & a boy in this specific order?Label the allele for both purple & white flower color, a homologous pair, & the lo us of the flower color gene. What is the difference between the nucleotide sequences of the purple flower allele compared to the white flower allele? Circle the allele which does not produce a function gene product.In pea plants, T is the allele for tall plants, while t is the allele for dwarf plants. If you have a tall plant, demonstrate with a testcross how it could be determined if the plant is homozygous tall or heterozygous tall.If two genes are linked on the same chromosome, we call this combination the parental combination. These genes will be transmitted as a unit and will not sort independently. However, during meiosis, crossing over occurs between homologous chromosomes, and the linked genes can become "unlinked." In general, the farther two genes are from each other along the chromosome, the more often they will come "unlinked." Genetic recombination is the process during which linked genes become unlinked. What do geneticists call the offspring that show these new combinations?How does the chromosome theory of inheritance provide a physical explanation for Mendelian inheritance?Alfred H. Sturtevant, a student of Thomas Hunt Morgan, used assumptions from observations of crossovers to map genes. What is a linkage map?What unusual result suggested that the eye-color trait is located on the X chromosome?Are the resultant daughter cells of meiosis I haploid or diploid?
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