Biology 8e Campbell Chapter 15 The Chromosomal Basis of Inheritance Multiple Choice Questions 1 Why did the improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics It revealed new and unanticipated features of Mendel s pea plant varieties It allowed the study of meiosis and mitosis revealing parallels between behaviors of genes and chromosomes C It allowed scientists to see the DNA present within chromosomes It led to the discovery of mitochondria It showed genes functioning to direct the formation of enzymes Answer When Thomas Hunt Morgan crossed his red eyed F1 generation flies to each other the F2 generation included both red and white eyed flies Remarkably all the white eyed flies were male What was the explanation for this result A B Topic Concept 15 1 Skill Knowledge Comprehension 2 The gene involved is on the X chromosome The gene involved is on the Y chromosome The gene involved is on an autosome 1 A B D E B C D Morgan and his colleagues worked out a set of symbols to represent fly genotypes Which of the following are representative A Other male specific factors influence eye color in flies Other female specific factors influence eye color in flies E Answer A Topic Concept 15 1 Skill Knowledge Comprehension 3 AaBb AaBb 46 XY or 46 XX B C vg vgse se vgvgsese D 2 3 Answer C Topic Concept 15 1 Skill Knowledge Comprehension 4 Sturtevant provided genetic evidence for the existence of four pairs of chromosomes in Drosophila in which of these ways A B C There are four major functional classes of genes in Drosophila Drosophila genes cluster into four distinct groups of linked genes The overall number of genes in Drosophila is a multiple of four 2 D E The entire Drosophila genome has approximately 400 map units Drosophila genes have on average four different alleles Answer B Topic Concept 15 1 Skill Knowledge Comprehension 3 A man with Klinefelter syndrome 47 XXY is expected to have any of the following EXCEPT 5 lower sperm count possible breast enlargement C increased testosterone long limbs female body characteristics Answer C Topic Concept 15 2 Skill Knowledge Comprehension 6 A B D E A B D E Masculine characteristics such as facial hair Enlarged genital structures C Excessive emotional instability Normal female Sterile female Answer D Topic Concept 15 2 4 A woman is found to have 47 chromosomes including 3 X chromosomes Which of the following describes her expected phenotype Males are more often affected by sex linked traits than females because males are hemizygous for the X chromosome male hormones such as testosterone often alter the effects of mutations on the X chromosome female hormones such as estrogen often compensate for the effects of mutations on the X X chromosomes in males generally have more mutations than X chromosomes in females mutations on the Y chromosome often worsen the effects of X linked mutations What is the chromosomal system for determining sex in mammals Skill Application Analysis 7 A B C D E A B C D E Answer A Topic Concept 15 2 Skill Knowledge Comprehension 8 Haploid diploid X 0 X X X Y Z W Answer 5 D Topic Concept 15 2 Skill Knowledge Comprehension 6 What is the chromosomal system for sex determination in birds 9 Haploid diploid A B C D E A B C D E X 0 X X X Y Z W E X 0 X X X Y Z W A Answer Topic Concept 15 2 Skill Knowledge Comprehension 10 Haploid diploid Answer Topic 7 What is the chromosomal system of sex determination in most species of ants and bees SRY is best described in which of the following ways A gene region present on the Y chromosome that triggers male development A gene present on the X chromosome that triggers female development An autosomal gene that is required for the expression of genes on the Y chromosome An autosomal gene that is required for the expression of genes on the X chromosome Required for development and males or females lacking the gene do not survive past early childhood Concept 15 2 Skill Knowledge Comprehension 11 Answer A Topic Concept 15 2 Skill Knowledge Comprehension 12 A B C D E A B D E Tortoiseshell females tortoiseshell males Black females orange males C Orange females orange males Tortoiseshell females black males Orange females black males 8 In cats black fur color is caused by an X linked allele the other allele at this locus causes orange color The heterozygote is tortoiseshell What kinds of offspring would you expect from the cross of a black female and an orange male Answer D Topic Concept 15 2 Skill Application Analysis 9 Red green color blindness is a sex linked recessive trait in humans Two people with normal color vision have a color blind son What are the genotypes of the parents 13 A XcXc and XcY B XcXc and XCY C XCXC and XcY D XCXC and XCY E XCXc and XCY Answer E Topic Concept 15 2 Skill Application Analysis 14 A B C D E Answer 0 25 50 75 100 E 10 Cinnabar eyes is a sex linked recessive characteristic in fruit flies If a female having cinnabar eyes is crossed with a wild type male what percentage of the F1 males will have cinnabar eyes a male inherits only one of the two X linked genes controlling hair color the males die during embryonic development the Y chromosome has a gene blocking orange coloration only females can have Barr bodies multiple crossovers on the Y chromosome prevent orange pigment production Topic Concept 15 2 Skill Application Analysis 15 Calico cats are female because A B C D E Answer A Topic Concept 15 2 Skill Application Analysis 16 A B C D 2 1 male to female 1 2 male to female 1 1 male to female 4 3 male to female 11 In birds sex is determined by a ZW chromosome scheme Males are ZZ and females are ZW A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female E 3 1 male to female Answer A Topic Concept 15 2 Skill Application Analysis 12 Refer to the following information to answer the questions below A man who is an achondroplastic dwarf with normal vision marries a color blind woman of normal height The man s father was six feet tall and both the woman s parents were of average height Achondroplastic dwarfism is autosomal dominant and red green color blindness is X linked recessive How many of their daughters might be expected to be color blind dwarfs 17 All None Half A B C D A B C D One out of four E Three out of four Answer B Topic