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Principles Of Genetics Quiz 38 (20 MCQs)

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1. Australian Shepherds are a breed of dogs whose coat color is directly impacted by two different genes. The gene that determines basic coat color exhibits a dominant allele (B) for black coat color and a recessive allele (b) for red coat color. Additionally, these dogs can have a solid coat color (mm) or a mixed pattern coat color called merle (Mm). The homozygous dominant coat color is called a lethal white (MM) which produces pups that are deaf and blind. What is the probability that two red Australian shepherds will produce a black pup?
2. The physical expression of a trait in an organism is known as the -
3. What type of traits "show up" in a population more often?
4. One cat has a heterozygous genotype, black fur (Bb), and its mate has a homozygous genotype grey fur (bb). Use a Punnett square to determine the probability of one of their offspring having grey fur.
5. What is the phenotypic ratio of a cross between two guinea pigs who are heterozygous for black fur and short hair (BbLl).
6. What is the probability that a single coin flip will come up heads?
7. If you cross two heterozygous traits (Rr x Rr), as Mendel did in his second experiment, what ratio will you get between offspring with the dominant and recessive phenotypes
8. When Mendel worked with pea plants, he noticed that some traits, like round seeds, seemed to hide other traits, like wrinkled seeds. What do we call the trait that hides or masks another trait?
9. Traits that are produced by several genes are
10. Phenotypes refer to the
11. In pea plants, green is dominant to yellow. A green pea plant (Gg) is crossed with a yellow pea plant (gg). What is the probability that an offspring will be yellow?
12. Many plant species are capable of producing offspring through self-pollination. In self-pollination, gametes formed by meiosis and are used to fertilize egg cells from the same plant. Which of the following statements describes why offspring produced through self-pollination can exhibit genetic diversity?
13. When 2 alleles do not blend but are both fully expressed (i.e. IAIB blood type), it is called .....
14. A population of birds migrates into a region with lots of nut trees. The number of birds with larger beaks are most likely to .....
15. Dom-
16. Results from the fusion of two gametes
17. 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
18. How many alleles do you get from each parent?
19. Round seeds (R) are dominant to wrinkled seeds (r). What is the genotype for a wrinkled offspring?
20. 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?
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