Concept explainers
a.
To explain: The type of inheritance of the given trait.
Introduction: The process of passing genetic information from parent to child is called inheritance. Gregor Mendel explains how genetic characteristics are passed down from generation to generation. According to him, there are three main principles of inheritance—genes that are passed on to the descendants determine the inheritance of each trait, the descendants inherit one gene from each parent for each trait, and a
b.
To give: The predicted genotype of the given individuals.
c.
To explain: The probability of the child of individual #6 and phenotypically normal male, having the trait.
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Study Guide for Campbell Biology
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- Examine the pedigree and answer the following questions; shaded individuals show the trait; genotypes are all unknown. The individual marked with the question mark is of an unknown genotype but does have the trait. A. What mode of inheritance is the most likely for this trait, autosomal recessive or autosomal dominant? State your rationale for full credit. B. What is the genotype of the individual marked with the question mark? (Heterozygous, homozygous, or unknown)arrow_forwardThe condition phenylketonuria is caused by a recessive allele. There are two carriers who have progeny.a. Give the gene notation. b. Give the expected genotypic and phenotypic ratios. c. What is the probability that their child will be heterozygous if they have a normal child?d. What is the probability of having two affected children and one normal child if they have three children?arrow_forwardAnswer the second question? About pros and consarrow_forward
- What mode of inheritance is exhibited? ____________________________________ Using the letters, Aand a, give the genotype of the following individuals: I1: __________ II4: __________ III9: __________ I2: __________ II5: __________ III14: __________ II3: __________ II8: __________ IV18: __________arrow_forwardPlease consider the following pedigree. Assume that people who marry in to the family do not carry the allele. Assume complete penetrance. I II III 3 IV 1 2 a. Is it possible for the inheritance pattern for the trait illustrated in this pedigree to be as a result of each of the following? Answer yes or no. (i) an autosomal recessive allele (AR) (ii) an autosomal dominant allele (AD) (iii) a X-linked recessive allele (XR) (iv) a X-linked dominant allele (XD) b. Based strictly on the characteristic patterns of inheritance that define the four different options in (a), give a definitive motivation for the most likely mode of inhertance.arrow_forwardIn this figure, the black circles and squares indicate a genetic disease. A. Based on the pedigree in the figure, does this gene appear to be inherited in a dominant or recessive manner? Explain your prediction. B. Use the letter a to indicate a disease allele and the letter A to indicate a normal allele. Predict the genotypes of the original parents. C. What percentage of the offspring of the original parents would you expect to have the disease? D. Predict the genotype of the partner of the diseased daughter in generation II. Justify your prediction.arrow_forward
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