I Alternative forms of a gene that influence the same trait and are found at the
ID: 282150 • Letter: I
Question
I Alternative forms of a gene that influence the same trait and are found at the same location in homologous chromosomes are called A) phenotypes. B) codominant. C) incomplete dominance. D) genotypes. E) alleles 2. in which of the following crosses would you expect to find a genotypic ratio of 3 : 1 among the F2 offspring? 3. If an organism shows a recessive phenotype, such as short pea plants, it can be A) TT, Tt, or tt. 8) only tt. C) either Tt or tt. D) either TT or Tt. E) only TT. 4. If an individual with a dominant phenotype is crossed with an individual with a recessive phenotype. parent? All 5 of their offspring exhibit the dominant phenotype. What is the most probable genotype of the first A) aa 8) The answer cannot be determined from this information. C) Aa D) AA 5. In peas, tall plan determine whether it is pure or hybrid? A) a heterozygous tall plant B) a short plant C) a pure tall plant D) It is impossible to determine the exact genotype ts are dominant over short plants. With which of these is it best to cross a tall plant to 6. A man that is heterozygous for freckles (dominant) reproduces with a woman that does not have freckles. What is the probability that their child will have freckles? A)096 B) 25% C) 50% D) 75% E) 100% 7. Two individuals with widow's peak and short fingers have a child with a continuous hairline and long fingers. What are the genotypes of the two individuals? (W widow's peak; S short fingers) 8. Two tall pea plant are crossed. Of 1000 offspring, 504 are tall and 496 are short.What is the genotype of the parents? C)Tt x t D) none of these 9. Assuming incomplete dominance, what is the expected outcome if a white flowered plant is crossed with a pink flowered plant? A) 50% red, 50% white B) 50% white, 50% pink C) 100% pink D) 50% red, 50% pink 10. True or False The expected outcome of a dihybrid cross is a phenotypic ration of 9:3:3:1. If we examine the phenotypes of the offspring we find that 9/16 dominant are for both traits, 3/16 areExplanation / Answer
1. Option E is correct.
Alternative forms of a gene = Alleles
2. Option D is correct.
Parental cross: Tt X Tt
Progeny: TT Tt Tt tt
3. Option B is correct.
A recessive phenotype is seen only in homozygous condition.
4. Option D is correct.
Parental cross: TT X tt
Progeny: Tt
5. Option B is correct.
A test cross refers to a cross between an unknown parent with a recessive homozygous parent.
6. Option C is correct.
Half of the progeny will inherit the dominant allele.
7. Option C is correct.
For a recessive phenotype to appear in the next generation, the parents must contain the recessive allele.
8. Option C is correct.
Parental cross: Tt X tt
Progeny: Tt Tt tt tt
9. Option B is correct.
Parental cross: rr X Rr
Progeny: Rr rr
10. TRUE
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