This quiz works best with JavaScript enabled. Home > Agriculture > Plant > Genetics > Principles Of Genetics – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Principles Of Genetics Quiz 7 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A trait that is expressed whenever an allele for it is present is known as A) Mean. B) Dominant. C) Recessive. D) Scary. Show Answer Correct Answer: B) Dominant. 2. The hereditary material that controls all cellular activities is called - A) ATP. B) DNA. C) Chloroplast. D) Cytoplasm. Show Answer Correct Answer: B) DNA. 3. Which of the following is homozygous DOMINANT? A) Y. B) YY. C) Yy. D) Yy. Show Answer Correct Answer: B) YY. 4. A plant that has purple flowers is crossed with one that has white flowers. The offspring were half white and half purple. What were the genotypes of the parents? A) PP x pp. B) Pp x Pp. C) PP x WW. D) Pp x pp. Show Answer Correct Answer: D) Pp x pp. 5. Orange (A) flowers are dominant over yellow flowers (a). A orange flowered plant pollinates a yellow flowered plant. If half the offspring are orange and the other half are yellow, what are the genotypes of the parents? A) Aa x Aa. B) Aa x aa. C) AA x aa. D) Aa x aa. Show Answer Correct Answer: B) Aa x aa. 6. Gregor Mendel is the father of genetics. What type of plants did he study? A) Pepper plants. B) Pea plants. C) Tomato plants. D) Tea plants. Show Answer Correct Answer: B) Pea plants. 7. All offspring plants in the F1 generation were purple because purple is the ..... trait. A) Recessive. B) Heterozygous. C) Dominant. D) Homozygous. Show Answer Correct Answer: C) Dominant. 8. Physical characteristics are called the A) Genotype. B) Phenotype. C) Dominant. D) Gamete. Show Answer Correct Answer: B) Phenotype. 9. A female guinea pig homozygous dominant for black fur color is mated with a male homozygous for white fur color. In a litter of eight offspring, probability would predict there would be ..... A) 8 black guinea pigs. B) 4 black and 4 white guinea pigs. C) 2 black, 4 gray, and 2 white guinea pigs. D) 8 white guinea pigs. Show Answer Correct Answer: A) 8 black guinea pigs. 10. Gene maps are based on A) The number of genes in a cell. B) Genetic diversity. C) The frequencies of crossing-over between genes. D) Independent assortment. Show Answer Correct Answer: C) The frequencies of crossing-over between genes. 11. In pigs, having a curly tail (T) is dominant over having a straight tail (t). Parent 1:Heterozygous Parent 2:HeterozygousWhat are the genotypes of the offspring from the Punnett square? A) TT, Tt. tt. B) 1 TT, 2 Tt, 1 tt. C) 3 curly, 1 straight. D) Tt, Tt. Show Answer Correct Answer: B) 1 TT, 2 Tt, 1 tt. 12. At the end of telophase II, what is the result A) 4 haploid daughter cells. B) 4 diploid daughter cells. C) 2 haploid daughter cells. D) 2 diploid daughter cells. Show Answer Correct Answer: A) 4 haploid daughter cells. 13. Which of the following could be another term used for heterozygous? A) Purebred. B) Same. C) Clone. D) Hybrid. Show Answer Correct Answer: D) Hybrid. 14. Why is it necessary for meiosis to produce cells with fewer chromosomes? A) It saves energy for the organism to produce fewer chromosomes. B) Asexual reproduction requires fewer chromosomes than sexual reproduction. C) Organisms reproduce sexually by joining two tetrads together. D) If it did not, the chromosome number would double in each generation. Show Answer Correct Answer: D) If it did not, the chromosome number would double in each generation. 15. If a person has a genotype of RR, what do you know about their gametes (sex cells)? A) They will all carry the R allele. B) They will all carry RR. C) Some will carry R, some will carry r. D) They will all carry the r allele. Show Answer Correct Answer: A) They will all carry the R allele. 16. The outward physical appearance and behavior of an organism as a result of its genotype A) Punnett Square. B) Phenotype. C) Recessive. D) Dominant. Show Answer Correct Answer: B) Phenotype. 17. Which of the following demonstrates non-disjunction during the formation of sperm? A) 22 autosomes and one Y-chromosome. B) 22 autosomes and one X-chromosome. C) 44 autosomes and two X-chromosomes. D) 23 autosomes and one X-chromosome. Show Answer Correct Answer: D) 23 autosomes and one X-chromosome. 18. In a cross between flowers where white is dominant and purple is recessive, which allele combination represents a purple flower? A) Ww. B) Pp. C) Ww. D) WW. Show Answer Correct Answer: A) Ww. 19. Which of the following is true about people who are heterozygous for sickle cell disease? A) They are resistant to malaria. B) They have some normal hemoglobin in their red blood cells. C) They are generally healthy. D) All of the above. Show Answer Correct Answer: D) All of the above. 20. A genotype refers to A) The alleles that manifest and we can see (attached earlobe). B) A homozygous nature. C) The alleles for a gene written in symbols (RR, Rr rr). D) None of above. Show Answer Correct Answer: C) The alleles for a gene written in symbols (RR, Rr rr). 21. Males are more likely to suffer from a sex-linked disease or disorder because A) Males are the weaker sex. B) Males have less DNA. C) Males have 1 X chromosome, so the disorder is more likely to be expressed. D) None of above. Show Answer Correct Answer: C) Males have 1 X chromosome, so the disorder is more likely to be expressed. 22. Yellow is dominant over green. If a heterozygous plant were crossed with a homozygous recessive plant, what percent of the progeny are green? A) 75%. B) 0%. C) 25%. D) 50%. Show Answer Correct Answer: D) 50%. 23. What is a males 23rd chromosome pair A) XY. B) XX. C) YX. D) None of above. Show Answer Correct Answer: A) XY. 24. The alleles that an organism has A) Recessive. B) Chromosome. C) Genotype. D) Phenotype. Show Answer Correct Answer: C) Genotype. 25. Which of the following is an example of a homozygous dominant genotype? A) RR. B) Rr. C) Rr. D) None of above. Show Answer Correct Answer: A) RR. 26. The heterozygous condition of sickle cell anemia (a recessive disorder) results in resistance to malaria. If a homozygous normal father and a heterozygous mother have a child, what are the chances of that child being resistant to malaria but not having sickle cell anemia? A) 25%. B) 50%. C) 75%. D) 100%. Show Answer Correct Answer: B) 50%. 27. Which phrase best describes the process of crossing over? A) Pairs of sister chromatids exchange segments. B) Pairs of homologous chromosomes become linked. C) Pairs of homologous chromosomes exchange segments. D) Pairs of sister chromatids become linked. Show Answer Correct Answer: C) Pairs of homologous chromosomes exchange segments. 28. In the ABO blood group system in humans, if a person of type-B blood has children with a person of type-AB blood, what blood types could their children have? A) Type-AB, type-A, and type-B. B) Type-A and type-B. C) Type-B and type-AB. D) Type-AB, type-A, type-B, and type-O. Show Answer Correct Answer: A) Type-AB, type-A, and type-B. 29. Which of these would best be described as a phenotype? A) Blue eyes. B) Tt. C) Mutation. D) Bb. Show Answer Correct Answer: A) Blue eyes. 30. How many chromosomes are in a human gamete? A) 22. B) 23. C) 46. D) 44. Show Answer Correct Answer: B) 23. ← PreviousNext →Related QuizzesPlant QuizzesAgriculture QuizzesPrinciples Of Genetics Quiz 1Principles Of Genetics Quiz 2Principles Of Genetics Quiz 3Principles Of Genetics Quiz 4Principles Of Genetics Quiz 5Principles Of Genetics Quiz 6Principles Of Genetics Quiz 8Principles Of Genetics Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books