In humans, having extra fingers or toes is caused by a dominant allele (E). People with two recessive alleles have 5 fingers and toes on each hand or foot. A. If two people both had the normal number of fingers and toes, is there any chance that their children could inherit the allele for extra fingers and toes? Do a Punnett square and show your work. B. If a man who was heterozygous for this gene married someone who was homozygous for the recessive allele, what fraction of their children would you expect to have extra fingers or toes? Do a Punnett square and show your work.

In humans, having extra fingers or toes is caused by a dominant allele (E). People with two recessive alleles have 5 fingers and toes on each hand or foot. A. If two people both had the normal number of fingers and toes, is there any chance that their children could inherit the allele for extra fingers and toes? Do a Punnett square and show your work. B. If a man who was heterozygous for this gene married someone who was homozygous for the recessive allele, what fraction of their children would you expect to have extra fingers or toes? Do a Punnett square and show your work.

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter14: Human Inheritance

Section: Chapter Questions

Problem 9SA: Alleles for Tay-Sachs disease are inherited in an autosomal recessive pattern. Why would two parents...

See similar textbooks

Similar questions

Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. a) Based on this pedigree, what is the most likely mode of inheritance? b) What is/are the possible genotype/s of person 1? c) What is/are the possible genotype (s) of person 4 ? Explain your answers.
. A man with a blood type AB is married to a woman with blood type A. They have natural children and one adopted child. These are the children with their blood type: Baltazar has blood type A, Melchor has blood type AB and Melchor has blood type O. a. Who was adopted? b. What genetic problem is this? (monohybrid, dihybrid or multiple allele) c. Show the Punnett square.
A pedigree lists a father as the proband for a genetic disorder that he inherited from his mother. Out of his 3 children, his son inherits the condition but his two daughters do not. What can you hypothesize about this disorder? a) It is an X-linked recessive disorder. b) His wife is also a carrier of an affected X-chromosome, too. c) His son had to inherit a defective X allele from his mother since he obviously received a Y from Dad. d) Although his daughters inherited the father's mutant X allele, a wt X allele from their mother prevented them from inheriting the disorder. e) All the answers could be correct.
In a trait that follows Mendelian rules of inheritance, what is the only way an organism can have the recessive phenotype? A. By having the homozygous recessive genotype B. By being heterozygous for that genotype C. It is not possible to get the recessive phenotype in Mendelian genetics D. If one parent is homozygous recessive for that trait, any offspring are guaranteed the recessive phenotype E. By being homozygous dominant for that genotype
Alleles for Tay-Sachs disease are inherited in an autosomal recessive pattern. Why would two parents with a normal phenotype have a child with Tay-Sachs? a. Both parents are homozygous for a Tay-Sachs allele. b. Both parents are heterozygous for a Tay-Sachs allele. c. New mutations gave rise to Tay-Sachs in the child. d. b or c
When you decide to breed your Labrador retriever Molly and sell the puppies, you discover that two of Mollys four siblings have developed a hip disorder that is traceable to the action of a single recessive allele. Molly herself shows no sign of the disorder. If you breed Molly to a male Labrador that does not carry the recessive allele, can you assure a purchaser that the puppies will also be free of the condition? Explain your answer.
In humans, the genetic disease cystic fibrosis is caused by a recessive allele (a). The normal (healthy) allele is dominant (A). What is the genotype of someone who has cystic fibrosis? What are the two different genotypes that a healthy person could have? If two people were both heterozygous for the cystic fibrosis gene, what fraction of their children would be likely to have this disease? Hint: Draw a Punnett square to figure it out.
Colour-blindness is the result of an X-linked recessive allele, Xc. The allele for normal eyesight is XC. (a) A woman with normal colour vision whose father was colour-blind marries a colour-blind man. Give the genotypes and phenotypes of their children. What ratio of their children can be expected to be colour-blind? (b) A man with normal colour vision whose father was colour-blind marries a woman carrier of the colour-blind allele. What is the likelihood that their children will be colour-blind? Carriers of the trait?
Fruit flies are very useful model organisms that have been used to study genetics. One mutant recessive trait in fruit flies is called "eyeless" because it causes flies to have no eyes. Cross an eyeless fly with a homozygous normal fly. a. Draw the Punnett square. b. What is the genotyoe ratio of the offspring? c. What is the phenotype ratio of the offspring? d. What genetic problem is this? (monohybrid, dihybrid or multiple allele)
The pedigree pictured is of an extended family where a large percentage of family members develop colon cancer at an early age. In this family, individuals either get colon cancer before the age of 16, or they don’t get it at all. a) Based on the information you have been given, what evidence, if any, suggests an inherited contribution to the development of this disease? b) You take a medical history of all 33 people in the pedigree and discover that a large percentage drink a special coffee on a daily basis, while others do not. The individuals who do not drink coffee are I-1, II-2, II-4, II-9, III-7, III-13, IV-1, and IV-3. Could drinking this special coffee play a role in colon cancer? Explain.
A couple who are about to get married learn from studying their family histories that, in both their families, theirunaffected grandparents had siblings with cystic fibrosis(a rare autosomal recessive disease).a. If the couple marries and has a child, what is theprobability that the child will have cystic fibrosis?b. If they have four children, what is the chance that thechildren will have the precise Mendelian ratio of 3:1 fornormal:cystic fibrosis?c. If their first child has cystic fibrosis, what is theprobability that their next three children will be normal?
How is it possible Jonathan has the dominant disorder, Huntington’s Disease, if none of his family had it? a) The mutant allele remained ‘hidden’ in previous generations. b) He is homozygous for mutant huntingtin alleles unlike his grandparents, who are clearly heterozygous for the condition. c) The appearance of Huntington Disease in him might be the result of a new mutation appearing during his lifetime. d) His parents and grandparents were ashamed to admit they had it.