What is Life? A Guide to Biology with Physiology
3rd Edition
ISBN: 9781464157745
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 6, Problem 17SA
Summary Introduction
To analyze:
Why a healthy individual can survive with only one X chromosome but not with only one Y chromosome.
Introduction:
The X and Y chromosomes vary in the genes they carry.
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Why is an X chromosome needed for survival?
The X chromosome has a lot of traits for things besides the traits we consider female. It carries traits forthings like the ability of your blood to clot correctly and the ability to see differences in the colors red andgreen. If you blood doesn’t clot correctly, it’s called Hemophilia. If you can’t see the difference betweenred and green, you are colorblind. Therefore, these are referred to as X-Linked or Sex-Linked Traits.Notice that those are on the X chromosome only. That means they are missing from the Y. In fact, the Y iscalled Y because it is physically missing a section at the end.
This means the Y chromosome is missing genes that the X chromosome has. If you are XY, you only haveone copy of the gene, or one allele.
Given what we just said above, can a XY parent pass a X-Linked Trait to his XY offspring?
Although there can be individuals born with only a single X chromosome, there are not individuals born who have no X chromosomes. With what you know, why do you think this might be?
Chapter 6 Solutions
What is Life? A Guide to Biology with Physiology
Ch. 6 - Prob. 1SACh. 6 - Prob. 2SACh. 6 - Prob. 3SACh. 6 - Prob. 4SACh. 6 - Prob. 5SACh. 6 - Prob. 6SACh. 6 - Prob. 7SACh. 6 - Prob. 8SACh. 6 - Prob. 9SACh. 6 - Prob. 10SA
Ch. 6 - Prob. 11SACh. 6 - Prob. 12SACh. 6 - Prob. 13SACh. 6 - Prob. 14SACh. 6 - Prob. 15SACh. 6 - Prob. 16SACh. 6 - Prob. 17SACh. 6 - Prob. 1MCCh. 6 - Prob. 2MCCh. 6 - Prob. 3MCCh. 6 - Prob. 4MCCh. 6 - Prob. 5MCCh. 6 - Prob. 6MCCh. 6 - Prob. 7MCCh. 6 - Prob. 8MCCh. 6 - Prob. 9MCCh. 6 - Prob. 10MCCh. 6 - Prob. 11MCCh. 6 - Prob. 12MCCh. 6 - Prob. 13MCCh. 6 - Prob. 14MCCh. 6 - Prob. 15MCCh. 6 - Prob. 16MCCh. 6 - Prob. 17MC
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- A diploid fruitfly has 8 chromosomes. How many chromosomes are present in an individual with trisomy in Chromosome 1 and Chromosome 2? A person is born with two X chromosomes, trisomy 21 and two copies of other chromosomes. How many chromosomes are present in this individual? * A couple is planning to have three children. What is the probability of having all boys? *arrow_forwardWhich of the following statements is correct regarding the human X chromosomes? It is the same size as other chromosomes and has the same number of genes. It is present in every somatic cell of males and females. It carries genes that determine an individual's biological sex. It is referred to as an autosome.arrow_forwardIf a woman is a carrier of a certain x linked disease and one of her X chromosomes is turned off in each cell how is it she doesn't have the disease?arrow_forward
- 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?arrow_forwardWhat are sex chromosomes? (answer in paragraph)arrow_forwardb) The body cells of chickens have 78 chromosomes in their nuclei.(i) State the number of chromosomes found in each sex cell of a chicken.arrow_forward
- The inactivation of one of the X chromosomes forms a structure known as a(n): telomere centromere autosome Barr body A man who carries a dominant X-linked trait will pass this trait on to: all of his sons all of his daughters half of his daughters and half of his sons half of his daughters An individual possessing two copies of the same sex chromosomes is known as: Question 3 options: heterogametic homozygous diploid homogameticarrow_forwardFor part c, do they consider the total sex chromosomes to be 2 or 3?arrow_forwardThis is the only combination of sex chromosomes that is lethal XXy (47) y-only (45) Xyy (47) X-only (45)arrow_forward
- Hemophilia results from a sex-linked gene. The disease is most common in males, but the hemophilia allele is on the X chromosome. Explain this apparent anomaly.arrow_forwardHemophilia in humans is due to an X-chromosome mutation. What will be the result of mating a hemophiliac female and male?arrow_forwardThe Y chromosome in humans is found as a pair in males. the only human sex chromosome. present only in females. normally found as a single copy.arrow_forward
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