EBK BIOLOGY:SCIENCE F/LIFE
6th Edition
ISBN: 9780134819167
Author: BELK
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
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.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
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…
Give possible sources of phenotypic variation and explain how these variations are inherited from one generation to another.
Chapter 8 Solutions
EBK BIOLOGY:SCIENCE F/LIFE
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
Knowledge Booster
Learn more about
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
- 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.arrow_forwardOn 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_forward
- What is meant by recessive allele? Explain with help of an example.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_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
- Use 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_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_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
How to solve genetics probability problems; Author: Shomu's Biology;https://www.youtube.com/watch?v=R0yjfb1ooUs;License: Standard YouTube License, CC-BY
Beyond Mendelian Genetics: Complex Patterns of Inheritance; Author: Professor Dave Explains;https://www.youtube.com/watch?v=-EmvmBuK-B8;License: Standard YouTube License, CC-BY