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Principles Of Genetics Quiz 25 (30 MCQs)

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1. A population of birds migrates into a region with lots of nut trees. The number of birds with larger beaks are most likely to .....
2. Results from the fusion of two gametes
3. In snapdragons, Tallness (T) is dominant to dwarfness (t). In a cross between two plants that are homozygous for the recessive allele, the percent of offspring expected to exhibit tallness is
4. How many alleles do you get from each parent?
5. Round seeds (R) are dominant to wrinkled seeds (r). What is the genotype for a wrinkled offspring?
6. Two identical twins live in the same city; one smokes and one doesn't. The one who smokes develops lung cancer. What is the best reason for this?
7. If you made a Punnett square showing Gregor Mendel's cross between true-breeding tall plants and true-breeding short plants, the square would show that the offspring had
8. Alternate forms of genes are called
9. The physical characteristic of an organism .....
10. DNA is sometimes referred to as a ladder. Which two molecules make up the sides of the DNA ladder?
11. When phenotypes produces by both alleles are clearly expressed (such as chickens with black feathers and chickens with white feathers crossed produce black/white speckled feathers)
12. The study of how traits are passed form one generation to the next is called .....
13. If two white sheep produce a black offspring, the parent's genotypes for colour must be
14. A tall plant is crossed with a short plant what is the expected outcome? (TT x tt)
15. In guinea pigs, short hair (S) is dominant over long hair (s). A short-haired male and a short-haired female produce mostly short-haired offspring, but a few were long-haired. What are the genotypes of the parents?
16. Tay Sachs disease is a fatal genetic disorder. Children born with this disorder generally die before they are five years old. A couple has had three children who died of Tay Sachs. About this couple it can safely be assumed that:
17. Which term describes multiple genes affecting the phenotype of one trait?
18. If a dog has 20 chromosomes in its sperm cell, how many chromosomes would its son have in its tail cell?
19. Which best describes an inherited trait?
20. How much of your DNA do you inherit from your mom?
21. Which of these BEST describes the primary goal of meiosis?
22. If red (R) is dominant over white (r), which genotype will cause a white color?
23. Specific characteristic of an organism, such as body color, is called a
24. Which of the following are reasons why Mendel worked with pea plants?
25. Suppose that in barley plants, the allele for tall stalks is dominant over short stalks and the allele for wide leaves is dominant over thin leaves. What would be the best way to determine the genotype of a barley plant with a tall stalk and wide leaves?
26. Which Mendelian Law states that when an organism is hybrid for a pair of contrasting traits, the dominant trait is the one that is shown.
27. Unlike mitosis, meiosis results in the formation of
28. In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the probability of having a white flowered plant if the parents were heterozygous red and homozygous red?
29. Snapdragon flowers come in red, pink and white. Pink is what type of inheritance is this?
30. Gregor Mendel removed the male parts from the flowers of some plants in order to
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