The XY sex determination system is found in Drosophila, where both female X-chromosomes are active. Flies...
The XY sex determination system is found in Drosophila, where both female X-chromosomes are active. Flies compensate for the two active X chromosomes by increasing transcription of the single male X ~two fold (hence, X/A = 1 in both males and females). What observation makes this mechanism not applicable to mammals?
Homework Answers
The mechanism to compensate for the two active X chromosomes by increasing transcription of the single male X ~ two fold is referred as Two fold up regulation.
For mammals, Adoption of two-fold up regulation by male (heterogametic) sex can create problems for the female (homogametic) members of the species, forcing them to cope up with the increasing numbers of genes whose expression had been increased by twofold. This is why, two fold down regulation (silencing of one of the two X chromosomes) in female mammals is considered as response for this overexpression ,
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The XY sex determination system is found in Drosophila, where
both female X-chromosomes are active. Flies...
1.a) How do we know that in humans the X chromosomes play no role in sex...
1.a) How do we know that in humans the X chromosomes play no role in sex determination, while the Y chromosome causes maleness and its absence causes femaleness? c) How do we know that X chromosomal inactivation of either the paternal or maternal homolog is a random event during early development in mammalian females? d) How do we know that Drosophila utilizes a different sex-determination mechanism than mammals, even though it has the same sex-chromosome compositions in males and females?...
Solve It: Does Sex Determination Have Only Two Possible Outcomes: Male or Female? One of the...
Solve It: Does Sex Determination Have Only Two Possible Outcomes: Male or Female? One of the most fundamental aspects of personhood is your biological sex: "It's a girl" or "It's a boyl" is often the first statement about who you are. Most people view biological sex as a straightforward, eitherfor issue-either a person is biologically male or biologically female. Like all biological characteristics, however, sex determination is achieved through a developmental process. All developmental processes exhibit variation, and sex determination...
Female fruit flies typically have two X chromosomes; male fruit flies typically have one X and...
Female fruit flies typically have two X chromosomes; male fruit flies typically have one X and one Y chromosome. They have other chromosomes too that are NOT sex chromosomes. Suppose there is a gene in fruit flies that influences the hairs a fly has on its thorax (the middle section of its body). A recessive allele of this gene causes the hairs to be very thick, while a dominant allele causes the hairs to be very thin. Suppose a heterozygous...
Fruit flies are sexually reproducing insects with separate male and female individuals. Like most mammals, including...
Fruit flies are sexually reproducing insects with separate male and female individuals. Like most mammals, including humans, males have an X and a Y chromosome, and females have two X chromosomes. Select the term that describes the organization of the sexual organs in the fruit fly. O hermaphroditic O monoecious O dioecious intersex
Name Sex-linked traits are genetic char segments of DNA found on chromosomes that Sex-Linked Traits Senetic...
Name Sex-linked traits are genetic char segments of DNA found on chromosomes that Sex-Linked Traits Senetic characteristics determined by genes located on sex chromosomes. Genies are and on chromosomes that carry information for protein production and that are sponsible for the inheritance of specific traits Genes exist in alternative forms called alleics. or a trail is inherited from each parent Like traits originating from genes on autosomes (non-se chromosomes), sex-linked to omosomes), sex-linked traits are passed from parents to offspring...
select the true statements regarding the roles of sex chromosomes in human development. Select the true...
select the true statements regarding the roles of sex
chromosomes in human development.
Select the true statements regarding the roles of sex chromosomes in human development. The X chromosome does not contain functional genes. An individual missing the SRY region of the Y chromosome will be phenotypically female. XXX females develop normally except for some slight physical abnormalities. XO females are viable, whereas YO males are inviable. Female cells typically contain two active X chromosomes which are both actively transcribed.
Scientists discover many new species with different mechanisms for dosage compensation between "male" and "female" organisms....
Scientists discover many new species with different mechanisms for dosage compensation between "male" and "female" organisms. Which of the following cases would result in correct sex chromosome dosage between males and females within the species? Choose ALL correct answers 4 points possible A species that has S and T sex chromosomes where males are ST and females are SS. Gene expression of the single chromosome in males is doubled and females do not inactivate either Schromosome. A species that only...
Scientists discover many new species with different mechanisms for dosage compensation between "male" and "female" organisms....
Scientists discover many new species with different mechanisms for dosage compensation between "male" and "female" organisms. Which of the following cases would result in correct sex chromosome dosage between males and females within the species? Choose ALL correct answers 4 points possible A species that has X and Y sex chromosomes where males are XY and females are XX. Gene expression of the SRY gene is doubled in males, and both of the X chromosomes is expressed in females. A...
Observation: Sex Chromosome Anomalies A female with Turner syndrome (XO) has only one sex chromosome, an...
Observation: Sex Chromosome Anomalies A female with Turner syndrome (XO) has only one sex chromosome, an X chromosome; the O signifies the absence of the second sex chromosome. Because the ovaries never become functional, these females do not undergo puberty or menstruation, and their breasts do not develop. Generally, females with Turner syndrome have a short build, folds of skin on the back of the neck, difficulty recognizing various spatial patterns, and normal intelligence. With hormone supplements, they can lead...
1. Among the following organisms, which organisms have sex chromosomes (XY)? A. lizard and alligator B....
1. Among the following organisms, which organisms have sex chromosomes (XY)? A. lizard and alligator B. tortoise and turtle C. anemone fish D. flies and humans E. all of the above 2. Among the following genes, which gene detects the ratio of autosomes to X chromosomes in flies? A. Sry B. Sxl C. Tra D. Dsx-M E. Dsx-F (Q3-6) The following are the various karyotypes we can observe among the organisms with the XY sex determination system. a. XYb. XXc....
Solve It: Does Sex Determination Have Only Two Possible Outcomes: Male or Female? One of the most fundamental aspects of personhood is your biological sex: "It's a girl" or "It's a boyl" is often the first statement about who you are. Most people view biological sex as a straightforward, eitherfor issue-either a person is biologically male or biologically female. Like all biological characteristics, however, sex determination is achieved through a developmental process. All developmental processes exhibit variation, and sex determination...
Fruit flies are sexually reproducing insects with separate male and female individuals. Like most mammals, including humans, males have an X and a Y chromosome, and females have two X chromosomes. Select the term that describes the organization of the sexual organs in the fruit fly. O hermaphroditic O monoecious O dioecious intersex
Name Sex-linked traits are genetic char segments of DNA found on chromosomes that Sex-Linked Traits Senetic characteristics determined by genes located on sex chromosomes. Genies are and on chromosomes that carry information for protein production and that are sponsible for the inheritance of specific traits Genes exist in alternative forms called alleics. or a trail is inherited from each parent Like traits originating from genes on autosomes (non-se chromosomes), sex-linked to omosomes), sex-linked traits are passed from parents to offspring...
select the true statements regarding the roles of sex
chromosomes in human development.
Select the true statements regarding the roles of sex chromosomes in human development. The X chromosome does not contain functional genes. An individual missing the SRY region of the Y chromosome will be phenotypically female. XXX females develop normally except for some slight physical abnormalities. XO females are viable, whereas YO males are inviable. Female cells typically contain two active X chromosomes which are both actively transcribed.
Scientists discover many new species with different mechanisms for dosage compensation between "male" and "female" organisms. Which of the following cases would result in correct sex chromosome dosage between males and females within the species? Choose ALL correct answers 4 points possible A species that has S and T sex chromosomes where males are ST and females are SS. Gene expression of the single chromosome in males is doubled and females do not inactivate either Schromosome. A species that only...
Scientists discover many new species with different mechanisms for dosage compensation between "male" and "female" organisms. Which of the following cases would result in correct sex chromosome dosage between males and females within the species? Choose ALL correct answers 4 points possible A species that has X and Y sex chromosomes where males are XY and females are XX. Gene expression of the SRY gene is doubled in males, and both of the X chromosomes is expressed in females. A...
Observation: Sex Chromosome Anomalies A female with Turner syndrome (XO) has only one sex chromosome, an X chromosome; the O signifies the absence of the second sex chromosome. Because the ovaries never become functional, these females do not undergo puberty or menstruation, and their breasts do not develop. Generally, females with Turner syndrome have a short build, folds of skin on the back of the neck, difficulty recognizing various spatial patterns, and normal intelligence. With hormone supplements, they can lead...
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