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Introduction:
The pedigree chart helps to depict the complete history of the pattern of inheritance of genetic disease from one generation to another generation. The inheritable genetic disease is either autosomal dominant or recessive or sex-linked based on which the probability of disease in a future generation can be predicted.
Answer to Problem 1SQ
Correct answer:
The pedigree chart is useful in studying the inheritance patterns for organisms that produce few offspring per generation. Hence, the correct answer is option b.
Explanation of Solution
Reason for correct answer:
Option b. is given as “few offspring per generation.”
The pedigree chart is an important analysis tool that helps to carefully evaluate the inheritance patterns and the manner in which the genetic diseases are passed on from one generation to next. This can also help in early diagnosis and treatment
Reason for incorrect answer:
Option a. is given as, “produce many offspring per generation.”
The organisms that have high offspring rate cannot be depicted using a pedigree chart due to the inability to accommodate such large numbers in the graphical representation. Hence, option a. is incorrect.
Option c. is given as, “have a very large chromosome number.”
The gene number does not affect the pedigree chart. Hence, option b. is incorrect.
Option d. is given as, “reproduce asexually.”
The organisms that reproduce asexually do not undergo recombination so cannot be represented through the pedigree chart. Hence, option c. is incorrect.
Option e. is given as, “have a fast life cycle.”
The organisms with a faster life cycle produce a large number of offspring in a given time which cannot be shown through the pedigree chart. Hence, option e. is incorrect
Hence, the options a., c., d and e. are incorrect.
The pedigree chart helps to demonstrate the genetic inheritance of disease in an organism that has few offspring per generation. Thus, the correct answer is b.
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Chapter 14 Solutions
EBK BIOLOGY: CONCEPTS AND APPLICATIONS
- 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)arrow_forwardYou are conducting a genetic experiment with flies. BB represents flies with black eyes and bb corresponded to flies with red eyes. You crossbreed Bb flies with other Bb flies. What will be the eye color of the offspring?arrow_forwardGenetics Constrict a Table: (i) Compare and contrast the down syndrome, pattau syndrome, turnor syndrome, Klinefelter syndrome, trisomy 21, trisomy 18. (ii) compare and contrast the different inheritance disorders in pedigree. (iii) compare and contrast the mendalin and non- mendalin types in detail (with all types). Thanks in advance.arrow_forward
- Two pea plants that are true-breeding for recessive white flowers are mated and their offspring analyzed. Which of the following statements about this situation is true? Group of answer choices A)The offspring represent the P generation. B)The gametes produced by the offspring will carry only one allele for this gene. C)Both parents are referred to as heterozygotes. D)Half of the offspring will be true-breeding for white flowers.arrow_forwardWhich of the following statements is true?a. Not all inheritance patterns follow a strict dominant/recessive relationship.b. Geneticists want to understand both inheritance patterns and theunderlying molecular mechanisms that cause them to happen.c. Different inheritance patterns are explained by a variety ofdifferent molecular mechanisms.d. All of the above are true.arrow_forwardIn a college genetics laboratory course, a healthy student constructs a karyotype from a cell from inside her cheek. She finds only one chromosome 3 and one chromosome 21, plus two unusual chromosomes that do not seem to have matching partners. a. What type of chromosomal abnormality does she have? b. Why doesn’t she have any symptoms? c. Would you expect any of her relatives to have particular medical problems?arrow_forward
- Part A) You cross a fly with straight wings with a fly with curved wings to produce the F1 generation, all of which exhibit straight wings. In the F2 generation, you observe 65 straight-winged flies and 16 curved-wing flies. Based upon the results, which phenotype is recessive? Part B) You think this trait is controlled by a single gene, but the F2 numbers don’t quite match a 3:1 expected ratio. Perform a chi-square analysis to determine if the variation you observe is due to chance or not. Based upon this determination, would you keep or reject the “null hypothesis”? Show your work and explain your reasoning.arrow_forwardAlleles 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 carrow_forwardPedigrees are frequently used to study patterns of inheritance in various organisms,especially in humans. List 2 factors which could make the construction of a humanpedigree difficult.arrow_forward
- Fruit flies with one allele for curly wings (Cy) andone allele for normal wings (Cy+) have curly wings.When two curly-winged flies were crossed, 203curly-winged and 98 normal-winged flies wereobtained. In fact, all crosses between curly-wingedflies produce nearly the same curly : normal ratioamong the progeny.a. What is the approximate phenotypic ratio in theseoffspring?b. Suggest an explanation for these data.c. If a curly-winged fly was mated to a normalwinged fly, how many flies of each type would youexpect among 180 total offspring?arrow_forwardBased on the ideas proposed by Morgan, which of the followingstatements concerning linkage is not true?a. Traits determined by genes located on the same chromosome arelikely to be inherited together.b. Crossing over between homologous chromosomes can create newallele combinations.c. A crossover is more likely to occur in a region between two genesthat are close together than in a region between two genes that arefarther apart.d. The probability of crossing over depends on the distance betweenthe genes.e. Genes that tend to be transmitted together are physically located onthe same chromosomearrow_forwardImagine that you went to the pet store and bought two black guinea pigs that are known to be heterozygoues (Bb). You also kno whtat black fur (BB) is dominant over white fur (bb), and a that a lethal recessive allele is located only one cM away from the recessive (b) allele. You decide to start raising your own guinea pigs, but after mating these animals several times, you discover they only produce only black progeny. a) How would you explain this result b) what is the probability of your two black guinea pigs producing white offspring? c) If an average mating produces 10 offspring, how many matings would it take to produce a white offspring?arrow_forward
