Biology: Science for Life with Physiology (5th Edition)
5th Edition
ISBN: 9780321922212
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 8, Problem 3AAATB
Draw a pedigree of a mating between first cousins and use the pedigree to explain why matings between relatives can lead to an increased likelihood of offspring with rare recessive diseases.
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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.
As 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…
The 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.
Chapter 8 Solutions
Biology: Science for Life with Physiology (5th Edition)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Consider 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_forwardIf both parents are recessive short, what is the genotype in percentage (%) for the possible offspring?Use the reference sheet to answer.arrow_forwardIf both parents are recessive short, what is the phenotype in percentage (%) for the possible offspring? Use the reference sheet below to answer.arrow_forward
- Use 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_forwardUse a chi-square test to determine if the observed numbers of progeny fit the number expected with independent assortment.arrow_forwardConsider 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_forward
- Cystic 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_forwardIn a population where only the total number of individuals with the dominant phenotype is known, how can you calculate the percentage of carriers and homozygous recessives?arrow_forwardYou discover a new allele of a gene important for tail formation in mice. WT mice have long tails, but mice heterozygous for the allele have short tails. When you cross two heterozygous mice together, you obtain a 2:1 ratio of short-tailed mice to long-tailed mice. None of the short-tailed progeny are homozygous. What type of allele results in short tails? A) dominant negative allele B) temperature-sensitive allele C) lethal allele D) partially dominant allele E) incompletely penetrant allelearrow_forward
- Use the genotype of the two parents in the pedigree to decide if the white lock of hair is dominant or recessive . explain How many males shown in the chart have a white lock of hair ?arrow_forwardIn a drosophila , the allele for normal wing length is dominant over the allele for short wings. In a population of 1000 individuals, 360 show the recessive phenotype. How many individuals would you expect to be homozygous dominant for the trait.arrow_forwardConsider the pedigree Figure1. Unless there is evidence to the contrary, assume that individuals that have married into the family do not carry the recessive gene for the trait. Figure1. Human pedigree showing four generations. Circles represent females, and squares represent males. Shaded circles and squares represent albino individuals. What is the probability of cousins 1 x 12 producing an albino offspring? 4 x 5? 2 x 14? 12 x 16? 7 x 15? 16 x 17?arrow_forward
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