Download Bluff Questions for Genetics Test

Sch. Biology Bluff Questions for Genetics Test
1. An allele that masks the expression of another allele is called what?
a. Dominant
2. What is the genotype of an individual that has two different alleles for a particular gene?
a. Heterozygous
3. The unknown genotype of an individual with a dominant phenotype can be determined
using what?
a. Test cross
4. A trait that occurs in both males and females equally is autosomal or sex linked?
a. Autosomal
5. If all of the offspring in a test cross have the dominant trait then was the original
individual homozygous dominant or heterozygous?
a. Homozygous dominant
6. If a trait is not found in every generation is it a dominant or recessive trait?
a. Recessive
7. In blood typing 2 dominant alleles are expressed at the same time. This is what type of
dominance?
a. Codominance
8. The study of heredity is called what?
a. Genetics
9. The passing of traits from parents to offspring is called what?
a. Heredity
10. The physical appearance of a trait in an organism is called what?
a. Phenotype
11. A genetic trait that appears in every generation of offspring is called what?
a. Dominant
12. What diagram is used to determine the probable outcome of a genetic cross?
a. Punnett square
13. Is hemophilia autosomal or sex-linked?
a. Sex-linked
14. What is the genotype of an organism with two dominate alleles?
a. Homozygous dominant
15. In snapdragons a cross between red and white snapdragons will result in pink offspring.
This is an example of what type of dominance?
a. Incomplete dominance
16. List one of Gregor Mendel’s hypotheses.
a. For each inherited trait, an individual has two copies of the gene-one from each
parent. (homologous chromosomes)
b. There are alternative versions of genes (which Mendel called factors). (allele)
c. When two different alleles occur together, one of them may be completely expressed,
while the other may have no observable effect on the organism's appearance.
(dominate vs. recessive)
d. When gametes are formed, the alleles for each gene in an individual separate
independently of one another(law of independent assortment). Thus, gametes carry
only one allele for each inherited trait (law of segregation). When gametes unite
during fertilization, each gamete contributes one allele.
21. What is the expected genotypic ratio resulting from a homozygous dominant x
heterozygous individual in a cross?
a. 50% He; 50% HD
22. What is the expected genotypic ratio resulting from a heterozygous x heterozygous
individual in a cross?
a. 25% HD; 50% He; 25% HR
23. What is the expected phenotypic ratio resulting from a heterozygous x heterozygous
individual in a cross? (Red dominant over orange)
a. 75% red; 25% orange
24. What is the expected phenotypic ratio resulting from a homozygous dominant x
heterozygous individual in a cross? (Red dominant over orange)
a. 100% red
25. A trait occurs mostly in males. Is it autosomal or sex-linked?
a. Sex-linked
26. A cross of 2 individuals for a single contrasting trait is called what?
a. Monohybrid
27. A cross of 2 individuals for a two contrasting trait is called what?
a. Dihybrid
28. A trait in a pedigree skips a generation. Is it dominant or recessive?
a. recessive
29. How are females represented in a pedigree?
a. circle
30. How are males represented in a pedigree?
a. square
31. In pea plants purple flowers (P) are dominant to white (p) and tall plants (T) are dominant
to short plants (t). What is the phenotype of a plant with the genotype PpTt?
a. Purple flowers and tall
32. What is the phenotype of a plant with the genotype pptt?
a. white flowers and short