EBK BIOLOGY
5th Edition
ISBN: 8220101337627
Author: Maier
Publisher: PEARSON
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Chapter 8, Problem 10LTB
Summary Introduction
Introduction:
The allele is the form of a single gene present in an organism. The different combination of the alleles determines the genotype and
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In humans, the ABO blood type is under the control of
autosomal multiple alleles. Color blindness is a recessive
X-linked trait. If two parents who are both type A and have
normal vision produce a son who is color blind and is type
O, what is the probability that their next child will be a
female who has normal vision and is type O?
Colorblindness is inherited as an X-linked recessive trait while pattern baldness is controlled by an autosomal
gene that is dominant in males but recessive in females. A colorblind man who is also homozygous for baldness
has children with a woman who carries normal genes for both traits. What is the probability that any of their child
will be:
a. Colorblind, bald male
b. Colorblind, normal-haired male
c. Female with normal sight and bald
Hemophilia is an X-linked recessive phenotype. Suppose a man who expresses the hemophilia phenotype has children with a woman who has the normal phenotype (and does not have a family history of hemophilia). If the couple have a son, what are the chances that he will have hemophilia?
A) 50%
B) 25%
C) 0%
D) 100%
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- Analysis of X-Linked Dominant and Recessive Traits A young boy is color-blind. His one brother and five sisters are not. The boy has three maternal uncles and four maternal aunts. None of his uncles children or grandchildren is color-blind. One of the maternal aunts married a color-blind man, and half of her children, both male and female, are color-blind. The other aunts married men who have normal color vision. All their daughters have normal vision, but half of their sons are color-blind. a. Which of the boys four grandparents transmitted the gene for color blindness? b. Are any of the boys aunts or uncles color-blind? c. Is either of the boys parents color-blind?arrow_forwardRed-green color blindness in humans is due to an X- linked recessive gene. Both John and Cathy have normal color vision. Cathy is adopted, and knows nothing about her biological parents. After 10 years of marriage to John, Cathy has given birth to a color-blind daughter and a color-blind son. John filed for divorce, claiming that he is not the father of at least one of the children. Is John justified in his claim of nonpaternity? Yes. He cannot be the father of Cathy's son. b. Yes, He cannot be the father of either child. O c. No. He is the father of both children. d. Yes. He cannot be the father of Cathy's daughter. Next page ge ems: X Inactivation, Nondisjunction, Quiz 3 Sex-linked Traits> Jump to... Pedigree FEB 17 MacBook Air 80 DII DD F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 @ #3 $4 & *arrow_forwardRed-green color blindness is an X-linked recessive disorder. A woman with normal vision whose father was colorblind has children with a man with normal color vision. What is the probability that their first child will be colorblind? A) 1/4 B) 1/2 C) 3/4 D) 0 E) 1arrow_forward
- Colorblindness is an X-linked trait found in humans. What are the chances that a colorblind man will pass it on to his son? Please explain.arrow_forwardA female carrier of the X-linked recessive gene for red-green color blindness will display a phenotype of normal vision. red-green color blindness. XXC.arrow_forwardA certain type of deafness in humans is inherited as an X-linked recessive trait. A man with this type of deafness married a normal woman, and they are expecting a child. They find out that they are distantly related. Part of the family tree is shown here.How would you advise the parents about the probability of their child being a deaf boy, a deaf girl, a normal boy, or a normal girl? Be sure to state any assumptions that you make.arrow_forward
- y 301 Amelogenesis imperfecta is X-linked dominant. Affected XY individuals have extremely thin enamel on the teeth while XX carriers have grooved teeth from uneven deposition of enamel. If an unaffected XY individual were to produce children with a XX carrier partner, a. what would be the expected chance of a XY child being affected with the disease? b. what would be the expected chance of a XY child being affected with the disease?arrow_forwardHemophilia is another example of an X-linked disease caused when a recessive allele (Xh) is expressed. If a normal male reproduces with a heterozygous normal female, what are the expected genotypes and phenotypes? Will any of their daughters develop hemophilia?arrow_forwardD. If a man is color-blind, which parent did he inherit the gene from? Explain your answer. E. Which parent does a man get all his x-linked genes from? F. If a woman is color-blind, what do you know about the genotypes and phenotypes of her parents? G. Are men more likely than women to get a genetic disease which is x-linked and dominant? Are they more likely to get a disease that is x-linked and recessive? Explain your answers. H. Can a man with normal color vision have a colorblind daughter? Explain your answer. I. Which parent determines the sex of a child?arrow_forward
- In humans, an X-linked disorder called coloboma iridia (a fissure in the iris_ is a recessive trait. A normal couple has an afflicted daughter. What would be the most plausible scenario for this situation? the female is not the biological mother, but the male is the biological father the father carries one recessive allele, and the mother carries one recessive allele the mother carries two recessive alleles the male is not the biological father, but the female is the biological mother both parents are heterozygous for the traitarrow_forwardThe allele for color-blindness is carried on the X chromosome. Making color blindness (a recessive trait) an X - linked trait. A colorblind make and a carrier female for color blindness. (But is not colorblind herself) have a child. Show your work! A) what is the % chance that their son will be color blind? B) what is the % chance that their daughter will be color blind?arrow_forwardHemophilia is another example of a X-linked disease caused when a recessive allele (Xh) is expressed. If a normal male reproduces with a heterozygous normal female, what are the expected genotypes and phenotypes? Will any of their daughters develop hemophilia? As in the previous question, you must also give the gender of the child in your genotype and phenotype descriptions here.arrow_forward
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