Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 7, Problem 8PDQ
What specific observations (evidence) support the conclusions about sex determination in Drosophila and humans?
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What will be the effect on sexual development in newly fertilized Drosophila embryos if the following genes are deleted?
Q. sex-lethal
How does sex determination in Drosophila differ from sex determination in humans?
What specific observations (evidence) support the conclusions about sex determination in Drosophila and humans?
Sort each observation to the appropriate bin. If an observation applies to both Drosophila and humans, sort it to the "Both" bin. If an observation does not apply to either
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Three sets of autosomes
per X chromosome
are required for male fertility.
Sex chromosomes
are heteromorphic.
Maleness is determined
by lack of X chromosomes.
Triploid individuals (3n)
could be phenotypically
normal females.
XO individuals are male.
More than one Y chromosome
is needed for maleness.
Diploid XXY individuals
are abnormal males.
Drosophila only
Humans only
Both
Neither
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Chapter 7 Solutions
Concepts of Genetics (12th Edition)
Ch. 7 - Campomelic dysplasia (CMD1) is a congenital human...Ch. 7 - Carbon Copy (CC), the first car produced from a...Ch. 7 - Gender is someones conscious and unconscious...Ch. 7 - Gender is someones conscious and unconscious...Ch. 7 - HOW DO WE KNOW? In this chapter, we have focused...Ch. 7 - Review the Chapter Concepts list on p. 151. These...Ch. 7 - Distinguish between the concepts of sexual...Ch. 7 - Contrast the XX/XY and XX/X0 modes of sex...Ch. 7 - Describe the major difference between sex...Ch. 7 - How do mammals, including humans, solve the dosage...
Ch. 7 - The phenotype of an early-stage human embryo is...Ch. 7 - What specific observations (evidence) support the...Ch. 7 - Describe how nondisjunction in human female...Ch. 7 - An insect species is discovered in which the...Ch. 7 - When cows have twin calves of unlike sex...Ch. 7 - An attached-X female fly, XXY (see the Insights...Ch. 7 - Assume that on rare occasions the attached X...Ch. 7 - It has been suggested that any male-determining...Ch. 7 - What is a Barr body, and where is it found in a...Ch. 7 - Indicate the expected number of Barr bodies in...Ch. 7 - Define the Lyon hypothesis.Ch. 7 - Can the Lyon hypothesis be tested in a human...Ch. 7 - Predict the potential effect of the Lyon...Ch. 7 - Cat breeders are aware that kittens expressing the...Ch. 7 - In mice, the Sry gene (see Section 7.2) is located...Ch. 7 - The genes encoding the red-and...Ch. 7 - What is the role of the enzyme aromatase in sexual...Ch. 7 - In the wasp Bracon hebetor, a form of...Ch. 7 - The Amami spiny rat (Tokudaia osimensis) lacks a Y...Ch. 7 - In mice, the X-linked dominant mutation Testicular...Ch. 7 - When the cloned cat Carbon Copy (CC) was born (see...Ch. 7 - In reptiles, sex determination was thought to be...Ch. 7 - In chickens, a key gene involved in sex...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- What will be the effect on sexual development in newly fertilized Drosophila embryos if the following genes are deleted? Q. transformerarrow_forwardGive typed explanationarrow_forwardIn Drosophila sex determination (Check all that apply.) A) XY individuals transcribe the Sxl gene early but not late. B XX individuals carry the Sxl gene, XY individuals do not. XX individuals transcribe the Sxl gene, XY individuals do not. XX individuals express the Sxl protein, XY individuals do not. E) The Sxl transcript (Pre-MRNA) is spliced differently in XX compared to XY individuals.arrow_forward
- What will be the effect on sexual development in newly fertilized Drosophila embryos if the following genes are deleted? Q. doublesexarrow_forwardWhat possible conclusions can be drawn from the observations that in male Drosophila, no crossing over occurs, and that during meiosis, synaptonemal complexes are not seen in males but are observed in females where crossing over occurs?arrow_forwardHow do we know that Drosophila utilizes a different sexdetermination mechanism than mammals, even though it has the same sex-chromosome compositions in males and females?arrow_forward
- In humans males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females are heterogametic. Also, describe as to who determines the sex of the unborn child and if temperature plays a role in sex determenination.arrow_forwardIn the nematode C. elegans, homozygosity for the e mutant allele causes an extreme "uncoordinated" phenotype, where the worm completely loses its ability to move. Examination of 100 individuals with genotype e/e reveals that 60 mutant worm can't move at all, 35 show a very reduced ability to move, and the remaining 5 seem to have a completely wild-type phenotype with respect to movement ability. These observations suggest that e has O incomplete penetrance and variable expressivity O low expressivity and variable penetrance Ohigh expressivity and variable penetrance O high penetrance and incomplete expressivityarrow_forwardIn Drosophila subobscura, the presence of a recessive gene called grandchildless (gs) causes the offspring of homozygous females, but not those of homozygous males, to be sterile. Can you offer an explanation as to why females and not males are affected by the mutant gene?arrow_forward
- How is lozenge eye in drosophila an example of pseudoallelism?arrow_forwardWhat would be the most likely effect on development of puncturing the posterior end of a Drosophila egg, allowing a small amount of cytoplasm to leak out, and then injecting that cytoplasm into the anterior end of another egg?arrow_forwardBrainbow is a genetic approach to fate mapping developed to label cells with a seeming rainbow of possible colors, which can be used to identify each individual cell in a tissue or even a whole embryo. Give the mechanics behind this technique. What are its applications to the field of Biology in general, and to Developmental Biology in particular?arrow_forward
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