Test Booklet. Subject: SC, Grade: HS Genetics Assessment. Student name:

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1 Test Booklet Subject: SC, Grade: HS Genetics Assessment Student name: Author: Megan Kitchens School: SHAW HIGH SCHOOL Printed: Monday January 30, 2017

2 1 In fruit flies, the gray body color (G) is dominant to the ebony body color (g). What is the genotypic ratio of the offspring of a heterozygous gray female and an ebony male? A 25% Gg, 75% gg B 50% Gg, 50% gg C 75% gray, 25% ebony D 100% gray 2 In Mendel s experiments with a single trait, the trait that disappeared in the first generation and reappeared in the next generation is called the A homozygous trait B dominant trait C recessive trait D heterozygous trait Page 1

3 3 A scientist conducted a study of an organism and found that its body cells contained 40 chromosomes. These cells were cultured in the laboratory, and cell division was observed. What difference, if any, would the scientist expect to observe between body cell division and sex cell division in the organism? A Body cells divide by mitosis, and sex cells divide by meiosis. B Body cells divide by meiosis, and sex cells divide by mitosis. C There is no difference; body cells and sex cells both divide by mitosis. D There is no difference; body cells and sex cells both divide by meiosis. 4 According to Mendel s law of segregation, which of the following statements describes what happens to the alleles of a gene pair? A The alleles are moved to different chromosomes. B The alleles are mutated in the process of mitosis. C The alleles are separated during fertilization. D The alleles are separated during gamete formation. 5 Which of the following laws or principles states that the two alleles of a gene pair separate during gamete formation? A law of segregation B principle of linkage C principle of dominance D law of independent assortment 6 In garden pea plants, the tall allele ( T ) is dominant to the short allele ( t ), and the round seed allele ( R ) is dominant to the wrinkled seed allele ( r ). Which of the following crosses could produce short pea plants with wrinkled seeds? A TtRr TTRR B TTRr TTRr C TtRr Ttrr D TtRR ttrr 7 In pea plants, the genes for seed color and seed shape are on different chromosomes. Which of the following explains why the genes for these traits are not inherited together? A natural selection B artificial selection C the law of segregation D the law of independent assortment Page 2

4 8 In fruit flies, the gene for red eye color is dominant to the gene for white eye color. The trait is sexlinked. What would be the genotype of a white-eyed female? A X R X r B X r X r C X R Y D X r Y 9 Assume that brown eyes (B) are dominant over tan eyes (b) in guinea pigs. When a brown-eyed male is mated with a tan-eyed female, 50% of the litter has brown eyes and 50% has tan eyes. What is the genotype of the female guinea pig? A BB B Bb C bb D bb 10 The phenotype of an animal depends MOST directly on -- A how the genes of the animal are expressed. B the metabolic rate of the animal. C the source of the animal s food. D how many cells are in the animal s body. Page 3

5 11 In pea plants, tall is dominant to short. To determine if a tall pea plant is heterozygous or homozygous for tallness, it should be crossed with a plant that is known to be A purebred tall. B purebred short. C heterozygous tall. D heterozygous short. 12 In pea plants, the trait for being tall (T) is dominant over the trait for being short (t). What is the expected phenotypic outcome of the F1 generation in the cross shown above? A 100% short B 50% tall C 75% short D 100% tall 13 A gardener planted red flowering plants in a garden. He crossed the red flowers with white flowers, and the offspring flowers were pink. This is an example of A incomplete dominance. B sex linkage. C multiple alleles. D homozygous inheritance. 14 A dominant gene that codes for white hair is represented by the symbol W. If a parent with the genotype WW is crossed with a parent of genotype Ww, what percent of their offspring will have white hair? A 25% B 50% C 75% D 100% Page 4

6 15 In corn plants, ragged leaves are dominant to smooth leaves. If two heterozygous ragged-leaf plants are crossed, what are the possible genotypes of the offspring? A Rr only B Rr and rr only C RR and rr only D RR, Rr, and rr only 16 Assume that in humans there is a 50/50 chance that a child will be a boy. If a certain mother and father have four sons, what are the chances that their fifth child will be a daughter? A 1 2 B 1 5 C 1 16 D In guinea pigs, the trait for ruffled fur is dominant over the trait for smooth fur. If a heterozygou male is crossed with a homozygous recessive female, what percent of the offspring would be expected to have ruffled fur? A 25% B 50% C 75% D 100% Page 5

7 18 A woman with Type AB blood marries a man with Type B blood. According to the Punnett square, their children could have each of these blood types EXCEPT A Type A. B Type B. C Type AB. D Type O. 19 The trait for flower color in the plants shown above is controlled by incomplete dominance. What percent of the offspring will have pink flowers? A 0% B 25% C 50% D 100% Page 6

8 20 A woman who is colorblind ( X c X c ) can expect A 100% of her female offspring to be colorblind. B 100% of her male offspring to be colorblind. C 0% of her female offspring to be colorblind. D 50% of her male offspring to be colorblind. Page 7 STOP