Sex Chromosomes Genetics Problem Set

Sex Chromosomes Genetics Problem Set

Problem Set 6 (Chapter 6)                                                                Name:


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Question 1:

A woman with X-linked color blindness and Turner syndrome has a color-blind father and a normal mother.


  1. A) In which of her parents did non-disjunction of the sex chromosomes occur?






  1. B) What is the woman’s genotype?






  1. C) What is the Father’s genotype?






  1. D) What is the Mother’s genotype?






  1. E) Setup and complete the Punnett Square between the Mother and Father:














Question 2:

Each of six populations (A-F) of Drosophila in different geographic regions had a specific arrangement of genes (1-9) on their chromosome 2:


(A) 123456789

(B) 122634789

(C) 154326789

(D) 143226789

(E) 162234789

(F) 1543226789


Assume that arrangement (A) is the original. In what order did the other arrangements most likely arise, and what type of chromosomal aberration is responsible for each change?





























Question 3:

You are touring a garden full of dragon fruit plants. Your guide explains that the plants are diploid and have 22 chromosomes. They share that the plants produce flowers that are white or purple depending on their genotype, with the white flower color being dominant to the purple flower color. Lastly, you learn that all the plants in the garden are heterozygous for the gene the controls flower color.


You notice a plant with white flowers on all but one vine. This one vine is producing a purple flower. You “borrow” a tissue sample from the vine with a purple flower and karyotype a cell, finding that it has 21 chromosomes. Assume that grafting did not occur.


The best explanation for the purple flower is…


  1. A) A mitotic nondisjunction occurred.


  1. B) A meiotic nondisjunction occurred.


  1. C) The cells from the white flowers are haploid and the cells from the purple flower are diploid.


  1. D) The cells from the purple flower are haploid and the cells from the white flowers are diploid.


  1. E) Trick question. The guide doesn’t know what they are talking about because you know that dragon fruit are really from hatched dragon eggs.