Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 10, Problem 6FTB
When the phenotype of heterozygotes is intermediate between the
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A morphological trait is the physical association between two genes because they are on the same chromosome, also the inheritance patterns showing dependant assortment of alleles that result from this association
true or false?
Color-blindness is a recessive disorder found on the X chromosome. There can be individuals that are carriers for
the trait (Of the two X chromosomes they have, only one has the colorblindness allele while the other is normal.
In this pattern of inheritance, all carriers are female). We express sex-linked traits with respect to our sex
chromosomes. For example, if the allele for colorblindness is "b" and the allele for normal color vision is "B",
then a female carrier is X x.
II
III
IV
6. What are the two sex chromosomes for females?
What are the two sex chromosomes for
males?
7. Is the Generation I male colorblind?
his sex chromosomes)?.
What is his genotype (be sure to express it with regard to
8. Why are all the females in Generation II carriers? (be careful: one of the females shown "married in" to the
family)
9. The first couple in Generation II has four children. Show the genotypes of their daughters. What is the
probability their daughters will be carriers?
10. If a female…
A gene is composed of two alleles. An allele can be either dominant or recessive. Suppose that a husband and wife, who are both carriers of the sickle-cell anemia
allele but do not have the disease, decide to have a child. Because both parents are carriers of the disease, each has one dominant normal-cell allele (S) and one
recessive sickle-cell allele (s). Therefore, the genotype of each parent is Ss. Each parent contributes one allele to his or her offspring with each allele being equally
likely. Complete parts a) through c) below.
a) Genes are always written with the dominant gene first. Therefore, there are two instances the offspring could have genotype Ss (one if the mother contributes the
dominant allele and the father contributes the non-dominant allele; and one if the father contributes the dominant allele and the mother contributes the non-dominant
allele). List the other two possible genotypes of the offspring.
(Use a comma to separate answers as needed.)
Chapter 10 Solutions
Biology: Life on Earth
Ch. 10 - Fill-in-the-Blank The physical position of a gene...Ch. 10 - Define nondisjunction, and describe common...Ch. 10 - In certain cattle, hair color can be red...Ch. 10 - Prob. 2GPCh. 10 - In the edible pea, tall (T) is dominant to short...Ch. 10 - In tomatoes, round fruit (R) is dominant to long...Ch. 10 - In the tomatoes of Problem 4, an F1 offspring...Ch. 10 - Prob. 6GPCh. 10 - In humans, one of the genes determining color...Ch. 10 - In the couple described in Problem 7, the woman...
Ch. 10 - An organism is described as Rr, with red coloring....Ch. 10 - 2. The inheritance of multiple traits depends on...Ch. 10 - Fill-in-the-Blank Many organisms, including...Ch. 10 - 4. Genes that are present on one sex chromosome...Ch. 10 - 5. When the phenotype of heterozygotes is...Ch. 10 - 1. Define the following terms: gene, allele,...Ch. 10 - 2. Explain why genes located on the same...Ch. 10 - 3. Define polygenic inheritance. Why does...Ch. 10 - What is sex linkage? In mammals, which sex would...Ch. 10 - What is the difference between a phenotype and a...Ch. 10 - 6. In the pedigree of part (a) of Figure 11–22, do...Ch. 10 - Sometimes the term gene is used rather casually....Ch. 10 - In an alternate universe, all the genes in all...Ch. 10 - Prob. 3AC
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- Armin and Annie are going to have a baby. Annie has dimples in her cheeks (a dominant trait), while Armin does not. You know that Annie's father has dimples in both cheeks, while her mother does not. Her mother must have the recessive trait. Annie's father has the dominant trait, but you don’t know if he is a homozygote or heterozygote. But you still know what Annie’s genotype must be because Annie must have a recessive allele since that is all she could have inherited from her mother. Since Annie has a dimples you know she inherited a dominant allele from her father. What are the chances Armin and Annie’s baby will have dimples? Determine the Phenotype and Genotype and its probability. Show your solution in a clean sheet of paper.arrow_forwardFor each example of gene expression, match the most likely pattern of inheritance. In summer squash fruit color may be white, yellow or green. Yellow is dominant over green. White hides the effect of yellow or green and is produced by ww. In rabbits coat color (full, chinchilla, Himalayan, albino) is determined by four different alleles. In sweat pea plants red coloration of flower is due to interaction of two genes, C and R. The white flower color is due to being either cc or rr regardless of the genotype for the other gene.…arrow_forwardHumans have a gene, "T," that is involved in muscle formation of the tongue. Individuals with the one allele can roll their tongues, while individuals with the other allele cannot. If both parents can roll their tongues but their child cannot, what can be said about the mode of inheritance? Also provide the genotypes of parents and child.arrow_forward
- A woman afflicted with a certain illness marries a normal man. They have four children (two boys and two girls); all boys have their mother's illness, but none of the girls have it. See individuals outline by blue square in the family tree below which indicates these individuals. Their children marry and have children of their own. Their family tree is shown below. What inheritance is it suggested? Give an explanation for your answer. Determine the genotype of all individuals seen the family tree above (use table below): Generation Individuals I 1. 2. II 3. 4. 5. 6. 7. 8. II 9. 10. 11. 12. 13. 14. 15.arrow_forwardSickle cell anemia is a genetic disease that causes red blood cells to form incorrectly, slowing the movement of blood and causing tissue damage. A person can be homozvgous dominant for normal blood cell shape, heterozygous or homozygous for sickle cells. Using this information and the figure below, determine the type of inheritance pattern that the sickle cell disorder follows.arrow_forwardWhich genotype is indicative of the carriers of a trait associated with an autosomal recessive inheritance pattern? Tt TT tt All of thesearrow_forward
- Albinism is the absence of pigment throughout the body. Animals with albinism have white fur and reddish eyes. Albinism is inherited as a recessive trait, so animals with two a alleles have albinism, whereas animals with at least one dominant A allele have normal coloring. Using the Punnett square below, determine the probability of two albino parents (with aa genotypes) producing a child with albinism.arrow_forwardThe last Emperor of Russia, Nicolas II, was married to Empress Alexandra, and they had fivechildren, Olga, Tatiana, Maria, Anastasia, and Alexis. Alexis was the only one who was afflictedwith hemophilia or the royal bleeding disease; all other members were normal. Research on this medical condition and determine the mode of inheritance. If only Prince Alexis was afflicted with the disease, determine his genotype. What could be the genotypes of the Emperor and Empress? Is it possible that each daughter could have been a carrier?arrow_forwardRed-green colorblindness is due to a sex-linked recessive gene. If two normal parents have a colorblind son, provide the genotypes of the parents and all the possible genotypes of their children.arrow_forward
- Achondroplasia is a form of dwarfism in humans. It is caused by a mutant allele of the fibroblast growth factor receptor 3 gene ( FGFR3) that produces an overactive protein. Having one copy of the mutant allele results in dwarfism. Two copies of the mutant allele results in death before birth. The mutant FGFR3 allele is completely penetrant. 1. What can you infer about the inheritance of the FGFR alleles? A) The mutant FGFR3 allele is pleiotropic. B) Some achondroplastic dwarfs are heterozygous for the mutant allele and some are homozygous. C) The wild-type and mutant FGFR3 alleles are codominant. D) The mutant FGFR3 allele shows incomplete penetrance. 2. If two people with achondroplasia have a child together, what is the probability that their child will also have achondroplasia? A)0 B)1/2 C)2/3 D) 3/4 E)1arrow_forwardNormal male Pikachu - straight tail Normal Female pikachu - Indented tail Abnormal Male Pikachu - Indented tail Abnormal Female Pikachu - staright tail Based on the chart explain the inheritance and the reasoning for the tails.arrow_forwardPiebaldism is a skin condition that causes an infant to be born with white birthmarks due to a genetic mutation. It is an autosomal dominant trait. A woman with piebaldism married a man without it. They have three daughters, two of whom also have piebaldism. One of their piebald daughters married a man who also has piebaldism and they have two sons with piebaldism, one son without it and one daughter with it. Draw the pedigree for this family and fill in as many of their genotypes as you can.arrow_forward
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