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Description: 1) What is Dosage compensation as it relates to sex chromosomes2) What is the Lyon's Hypothesis--Who is Mary Lyon's3) What is a Calico Cat? and How does one of these cats look and What has happened to their X chromosomes to make them look that way.IN

Science

Biology

1) What is Dosage compensation as it relates to sex chromosomes

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 2CT: Human sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how...

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. With regards to the grasshopper testes experiment, diakinesis is an ideal stage to determine chromosome number due to the degree of condensation of the chromosomes? Count the chromosomes at this stage. Does it represent a diploid or a haploid number?
What unusual feature of the Y chromosome allows some recombination among the genes found on it?
Barr bodies are formed to adjust X chromosome dosage in species other than humans, such as Drosophila (fruit flies) and C. elegans (nematodes). True or False ?
1. Maurice was born with an XY chromosome type, and he has the external genitalia of a male. He has, for the better part of his life, however, felt like he was supposed to be a woman. He has always identified more with feminine clothes, behaviors, and emotions. According to chapter 10 in your textbook, Maurice has a male __________. 2. Maurice was born with an XY chromosome type, and he has the external genitalia of a male. He has, for the better part of his life, however, felt like he was supposed to be a woman. He has always identified more with feminine clothes, behaviors, and emotions. According to chapter 10 in your textbook, Maurice has a female __________. 3. __________ is a biological phenomenon, while __________ is a socially constructed phenomenon. 4. A young boy develops facial and chest hair, pubic hair, and an enlarged Adam’s apple. This happens because puberty is stimulating the development of his ______.
Human sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele? c. If a female is heterozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele?
Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele? c. If a female is heterozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele?
What does the X/Y pair of chromosomes determine in humans?
Chorionic villus sampling is a procedure to determine if there are any abnormalities in chromosome number in the fetus. Why can the chorionic villi be used to determine abnormalities in the fetus?
Explain why a person with Klinefelter Syndrome (XXY) still exhibits abnormal phenotypes despite the fact that one of the extra X Chromosome is inactivated practically leaving an XY active sex chromosomes similar to a normal male?
Butterflies have an X-Y sex-determination system that is different from that of flies or humans. Female butterflies may be either XY or X0, while butterflies with two or more X chromosomes are males. This photograph shows a tiger swallowtail gynandromorph, which is half male (left side) and half female (right side). Given that the first division of the zygote divides the embryo into the future right and left halves of the butterfly, propose a hypothesis that explains how nondisjunction during the first mitosis might have produced this unusual-looking butterfly. Question is also in the picture.
Which of the following findings supports the fact that the presence of the Y-chromosome rather than the lack of a second X-chromosome determines the development of maleness in mammals? a. A human with an X0 genotype (Turner syndrome) is phenotypically female. b. A human with an XXY genotype (Klinefelter syndrome) is phenotypically male. c. A transgenic mouse with two X-chromosomes and the SRY gene from the Y-chromosome develops male sex organs. d. b and c, but not a e. a, b, and c
In some insects the female have two x chromosomes, while the males have One x chromosomes and no y chromosome .if the normal deploid number in an insect of this type is 14 what would be the number of chromosomes in the body cells of males and of females?