In the pedigree shown, mating between individuals III 2 and III 3 results in a progeny, which is an affected female. Based on this information, most likely this disorder is:
 

1.Holandric2.Sex-linked dominant
3.Sex-linked recessive4.Either 1 or 2

Subtopic:  Pedigree Analysis: Problem Solving |

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The number of linkage groups in a plant with a normal diploid number of chromosomes in a somatic cell as 16 will be:
1. 16
2. 8
3. 4
4. It is impossible to tell from the information provided.

Subtopic:  Understanding Linkage |
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In a fruit fly, the eye colour trait is located on X-chromosome and the vestigial wing trait is located on an autosome. What is the possibility that a cross between a white-eyed male fruit fly with vestigial wings and a wild-type female who is heterozygous for both traits will result in a female offspring with vestigial wings and white eyes?

1. 1/16 2. 1/8
3. ¼ 4. ½
Subtopic:  Chromosomal Basis of Inheritance: Further Considerations |

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The pedigree shows the inheritance of red-green color blindness in a family. If II 3 marries a color-blind man, what is the probability that her first child will be normal?

1. ¼ 2. ½
3. 2/3 4. ¾
Subtopic:  Pedigree Analysis: Problem Solving |

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The source of any of the genes located on either of the X chromosomes in a female cannot be:

1.Her Mother's Father.2.Her Father's Mother.
3.Her Mother's Mother.4.Her Father's Father.

Subtopic:  Sex Determination: Further Considerations |
 71%

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Consider three genes: X, Y, and Z. The recombination frequency between X-Y, X-Z, and Y-Z gene pairs was found to be 50%, 25%, and 50%, respectively. What would be the right inference?

1. genes X and Y are on the same chromosome
2. genes X and Z are on different chromosomes
3. genes Y and Z are on different chromosomes
4. All three genes are located on the same chromosome

Subtopic:  Recombination & Gene Mapping |
 56%

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The inheritance of the trait shown in the given pedigree most likely is:

 

1.Autosomal recessive2.Autosomal dominant
3.Sex-linked recessive4.Sex-linked dominant

Subtopic:  Pedigree Analysis: Problem Solving |
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A dihybrid test cross results in a recombination frequency of 50%. Most likely the two genes under consideration:

1. are closely linked on the same autosome
2. are located on heterologous chromosomes
3. are present on the X chromosome
4. are located on the same chromosome, one on either side of the centromere
Subtopic:  Recombination Gene Mapping |

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An F2 phenotypic ratio of 1: 4: 6: 4: 1 from a cross AaBb X AaBb is expected in the case of:

1. Dominant epistasis 2. Complementary genes
3. Polygenic inheritance 4. Independent assortment
Subtopic:  Polygenic Inheritance & Pleiotropy |
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If individuals of genotype AaBbCc are intercrossed, how many different phenotypes can appear in their offspring?

1.32.6
3.84.9

Subtopic:  Dihybrid Cross: Details |
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