Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 8, Problem 3AAATB
Summary Introduction
To determine:
The pedigree of mating between the first cousins.
The reason for mating between relatives can cause offspring to have recessive disorder.
Introduction:
In recessive disorder, two copies of abnormal gene are passed on to the off spring from the parents. Such diseases are, cystic fibrosis, sickle cell anemia, and tay-sachs disease. The pedigree analysis gives us the idea about the genetic makeup of our ancestors and future generation for a particular trait.
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Give an example of a family tree that shows the F^1 generation and F^2 generations of your mother and father side with dominant traits.
IN TRANSYLVANIA, SOME PEOPLE EXHIBIT TWO UNUSUAL TRAITS IN WHICH THEY HAVE VERY LONG FRONT TEETH AND THE INABILITY TO BE AWAKE WHEN THE SUN IS UP. BOTH OF THESE TRAITS APPEAR TO BE RECESSIVE. IF A WOMAN WHO IS HETEROZYGOUS FOR TEETH AND HOMOZYGOUS NORMAL FOR BEING IN THE SUN MARRIES A MAN WHO HAS BOTH THESE TRAITS, WHAT COULD BE THE PHENOTYPES AND GENOTYPES OF THEIR CHILDREN? USE A PUNNET SQUARE AND SHOW ALL WORK. LIST THE RATIOS FOR THE GENOTYPES AND PHENOTYPES.
Give possible sources of phenotypic variation and explain how these variations are inherited from one generation to another.
Chapter 8 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
Ch. 8 - What is the relationship between genotype and...Ch. 8 - Add labels to the figure that follows, which...Ch. 8 - Prob. 3LTBCh. 8 - Prob. 4LTBCh. 8 - Prob. 5LTBCh. 8 - Scientists have recently developed a process by...Ch. 8 - What is the physical basis for the independent...Ch. 8 - Prob. 8LTBCh. 8 - Prob. 9LTBCh. 8 - Prob. 10LTB
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- A particular species of flowering plant comes in three colors: Red, Blue, and Purple. Red is considered homozygous dominant, blue is considered homozygous recessive, and purple is considered heterozygous. Please use F to represent dominant alleles and f to represent recessive alleles. A member of this plant species that makes red flowers cross-pollinates with a member of the same species that makes blue flowers. In your answer, please state the mode of inheritance, the genotypes of both parents, and the genotypic and phenotypic ratios of the offspring.arrow_forwardThe diagram below describes the relationships of genes, alleles, and loci of genetics and how a genotype manifests as a phenotype using the pea plant flower as an example. In this case, the genotype is heterozygous, meaning that the plant carries two different alleles of the gene. Think of a scenario where you have a pea plant that is homozygous recessive in flower color. Determine the phenotype of the flower color for this plant and describe how the phenotype is derived based on the information provided in the below diagram. Make sure to include the following terms, gene, allele, locus, enzyme, and gene expression, in your discussion.arrow_forwardAs you have read, if an allele is paired with another one just like it, the name for the pair is homozygous. If the allele is paired with a different type, the pair is called heterozygous. You have also learned about how some alleles are domi- nant and some are recessive. A Punnett square shows how the pairs will possi- bly match up. Making a prediction about how the offspring will look is usually simple. If the pair is heterozygous or homozygous dominant, the dominant trait will be expressed. If the pair is homozygous recessive, the recessive trait will be expressed. There are some alleles, however, that behave like normal dominant alleles when in a heterozygous pair, but are deadly in a homozygous pair. For example, the alleles that control fur color in wild mice are yellow and black. The yellow allele is dominant (Y) and the black is recessive (b). When a mating occurs and the alleles are paired together, the hairs have yellow and black bands. From a distance this makes the mouse…arrow_forward
- On an island in the Pacific Ocean, there is a species of birds with different sized beaks, with one specific gene determining their beak size. Birds who are homozygous dominant (BB) or heterozygous (Bb) for this particular gene have small beaks, while birds who are homozygous recessive (bb) for this particular gene have big beaks. For each combination of parents below, predict the frequency with which each phenotype and genotype exists. Make sure to include gametes from each parent. 1) Homozygous Dominant ( BB ) x Homozygous Dominant ( bb ) Genotypes: Phenotypes: BB Big Beaks Bb Small Beaks Bb Hint, do your percentages above add up to 100%? 2) Homozygous Recessive ( bb ) x Heterozygous ( Bb ) Genotypes: Phenotypes: BB Big Beaks Bb Small Beaks Bb 3) Heterozygous ( Bb) x Heterozygous ( Bb ) Genotypes: Phenotypes: BB Big Beaks Bb Small Beaks Bb Review: What were all the alleles used above? How many possible genotypes do you expect to find within this species, for beak size?arrow_forwardConsider a mating between two individuals represented by genotypes NnTT X NNTt. Uppercase letters represent dominant alleles and lowercase letters represent recessive alleles. Assume the N and T loci segregate independently (i.e., are not linked). What is the frequency of double heterozygotes (NnTt) in the offspring of these matings? Group of answer choices 1/2 1/16 1/8 1/4arrow_forwardExplain the term outbreeding.arrow_forward
- List the barriers that prevent interbreeding and give an example of each.arrow_forwardUsing the information in the Punnett square that showing a cross between two parents, how would we refer to the parents and the offspring? a. One parent homozygous, one is heterozygous, the offspring are homozygous b. One parent is homozygous dominant, one parent is homozygous recessive, the offspring are heterozygous c. One parent is homozygous dominant , one parent is heterozygous recessive, the offspring are homozygous dominant d. One parent is heterozygous dominant, one is heterozygous recessive, the offspring are heterozygous dominant P generation: BB x bb Complete dominance: B = black rat b = white ratarrow_forwardUse the pedigree below to answer the following questions about dimples. The dimple gene controls whether a person has dimples or doesn't have dimples. No dimples is dominant to dimples. 3 Dimples gene (D) No dimples is dominant to dimples 10 11 12 13 14 1. How many family members have dimples? 2. What is the genotype of individuals I-3 and I-4? (3) hsband, (4) , (9) 3. Can either individual II-8 orII-9 be homozygous? (8) : Explain the family relationship between III-12 and I-2.arrow_forward
- Consider the following case of blending inheritance. A population of plants starts out with an equal number of individuals of heights 40 and 60 cm. The parents mate randomly, and the height of an offspring is exactly equal to the average height of its parents. Find all the ways that the heights of the grandparents average to exactly 50 cm.arrow_forwardCystic fibrosis is an autosomal recessive genetic disorder. Which statement BEST explains how cystic fibrosis is maintained in the gene pool? O A. Organisms that are heterozygous can pass on only the dominant allele. O B. Organisms that are homozygous-dominant pass on either dominant or recessive alleles. O C. Organisms that are heterozygous can pass on the recessive alleles because they are carriers of the disorders but do not show characterisitcs of the disorder becuase they have the dominant allele as well. O D. Organisms that are homozygous-recessive pass on only the dominant allele.arrow_forwardImagine you cross two closely related plant varieties: Maize and teosinte. You hypothesize that different alleles at just 5 genes are responsible for all the trait differences between the two plants. You take two inbred parent lines and cross them together to produce an F1 and then cross two F1 individuals together to produce F2 offspring. What proportion of the offspring do you expect to look exactly like each of the parent lines if your hypothesis is correct? Please show work using punnet squares.arrow_forward
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