11) Two syntenic genes, B and C, are located 25 cM apart in Drosophila. You cross a ccDD female fly to a male CCdd fly to produce F1 progeny. Next, you select an F1 female and perform a test cross. What proportion of the F2 progeny are expected to be ccDd? a) 12.5% b) 37.5% c) 25% d) 75% e) 50%

11) Two syntenic genes, B and C, are located 25 cM apart in Drosophila. You cross a ccDD female fly to a male CCdd fly to produce F1 progeny. Next, you select an F1 female and perform a test cross. What proportion of the F2 progeny are expected to be ccDd? a) 12.5% b) 37.5% c) 25% d) 75% e) 50%

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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ocx a) 0 b) 50 c) 75 d) 100 e) 150 Page of 12 A Alternative formats D - Wild type fruit flies have grey bodies and straight wings. Yellow bodies and curly wings are both recessive The body color gene is X-linked; the wild type allele is designated XY+. The wing shape gene is autosomal; the wild type allele is designated C+. You cross a pure breeding yellow-bodied, curly-winged female with a grey-bodied, straight-winged male to produce an F1 generation. Use this information to answer questions X-Y below. You cross two F1 flies to produce an F2 generation. What proportion of the F2 female flies are expected to have curly wings and yellow bodies? ZOOM + Info ✓
20) When Thomas Hunt Morgan crossed his red-eved F1 generation flies to each other, the F2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result? A) The gene involved is located on the Y chromosome. B) The gene involved is located on the X chromosome. C) The D) Other male-specific factors influence eye color in flies. gene involved is located on an autosome, but only in males.
A scientist working with Drosophila flies studies wing length, an X-linked characteristic. He has pure-breeding lines of short-winged and long-winged flies available. He decides to use reciprocal crosses for his work.i) What are reciprocal crosses? ii) Provide an example of the reciprocal crosses this scientist will do.iii) If the gene for wing length was sex-linked, but present in the pseudoautosomal region, what would you expect the outcome of a reciprocal cross to be with regards to males and females?
2) From a mating between two normal winged drosophila, 27 "dumpy-winged" and 79 normal winged offspring were produced. a) what is the nature of the dumpy wing allele? b) What were the genotypes of the parents?
In a cross between a white-eyed female (ww) and a red-eyed male (w+Y), nearly all the progeny were either red-eyed females (w+w) or white-eyed males (wY). However, about 1 in every 2000 F1 flies had an "exceptional phenotype" and was either a white-eyed female or red-eyed male. How did Bridges explain this unexpected result? A) Crossing over B) Incomplete cytokinesis C) Incorrect synapsis D) Nondisjunction E) Pseudoautosomal region
If in an offspring there is a "zigzag" segregation for the [y] mutant phenotype (recessive mutation) after crossing pure strain Drosophila: a) this indicates that the gene is carried on the Y chromosome b) no correct answer c) this indicates that the mother expressed the [y] mutant phenotype this indicates that it is a holandric gene d) e) this indicates that the gene is carried by an autosome f) this indicates that the father expressed the [y] mutant phenotype g) it indicates that the gene is carried by the W chromosome h) this indicates that the gene is carried on the X chromosome i) this indicates that the gene is sex-linked
A series of crosses were performed between pure breeding lines of mice with different coat colours. a) Based on the results of the crosses, describe the type of gene interaction that gives the white phenotype. Explain your reasoning. b) Determine the order of the function.
Two pure-breeding mutant plants produce white flowers. When they are crossed, all of the progeny have wild-type purple flowers. What does this genetic complementation tell you? A) The genes are part of two distinct biosynthetic pathways. B) The two lines exhibit different mutations in the same gene. C) More than one gene is involved in determining the phenotype. D) The allele is pleiotropic. E) The allele exhibits incomplete dominance.
In a testcross of a female Drosophila heterozygous for 3 linked, recessive genes the following phenotypes were observed and used to make a map of these genes. Calculate the interference. A---(3.0)---D-----(4.8)-----B A) There is negative interference. B) 1.44 C) 2.08 D) 1 E) 0
A female from true breeding line of Drosophila with white eyes is crossed with a male from a true breeding line with brown eyes. All of the offspring have wild type brick red eyes. Which of the following explanations is most likely? A) There are many alleles for the single gene for eye color. Wild type brick red eyes result only when the fly is heterozygous. B) The alleles for brown, white, and brick red eyes are alleles for a single locus. The allele for brown eye color is dominant to the allele for brick red eye color and to the allele for white eyes. C) There is more than one gene for eye color. The brown mutation and the white mutation occur in separate genes and are both recessive to the wild type alleles. The offspring are heterozygous for both genes, so they are phenotypically wild type. D) None of the above. It is not possible for a cross between a white-eyed and a brown-eyed fly to produce wild type offspring.
Females from a pure-breeding curly-winged strain are mated with males from a pure-breeding straight-winged (wild-type) strain. The F1 mate with each other to produce an F2 generation that consists of 160 flies with curly wings and 80 with straight wings. What can you infer from this observation? Explain your answer and why the other options do not qualify, A) Curly wings is a recessive trait. B) The dominant curly wing allele is also a recessive lethal. C) Wing shape is controlled by two codominant alleles. D) Two interacting genes determine wing shape. E) All of the hybrid F 1 flies had straight wings.
Two plants with white flowers, each from true-breeding strains, were crossed. All the F1 plants had red flowers. When these F1 plants were intercrossed, they produced an F2 consisting of 177 plants with red flowers and 142 with white flowers. (a) Propose an explanation for the inheritance of flower color in this plant species. (b) Propose a biochemical pathway for flower pigmentation and indicate which genes control which steps in this pathway.