1.Sex-linked traits are. A. carried on autosomes and expressed only in males B.

Question

1.Sex-linked traits are. A. carried on autosomes and expressed only in males B. coded for by genes located on the X chromosome C. are found in only males or only in females D. are always inherited from the father

2.The calico cat can be either male or female. (MOST OF THE TIME) (T/F)

3. Fruit flies were useful in figuring out why non disjunction occurs.(T/F)

4.Which disease is not sex-linked? A. cystic fibrosis B. hemophilia C. Duchenne muscular dystrophy D. color blindness

5. he importance of Morgan's fly experiments was that he discovered A. what a Barr body was. B. the basis of sex determination C. that some genes are sex linked D. what the cause of Klinefelter’s syndrome is E. the phenomenon of non-disjunction

6.Cri du chat results from A. trisomy 13 B. trisomy 21 C. a deletion in chromosome 5 D. a translocation

7. Both males and females have Barr bodies in their mitochondria. (T/F)

8. Most cases of Down syndrome are due to nondisjunction in meiosis I.(T/F)

9. Nondisjunction can occur during A. meiosis I B. meiosis II C. both A and B D. mitosis only

10. The probability of crossing over between two linked genes is greatest when the genes are A. located on separate chromosomes B. close together on the same chromosome C. further apart on the same chromosome D. dominant

Explanation / Answer

1-c

2-F

3-T

4-A

Note - female has two x chromosome and male are hemizyogoys thus they normally donot occur calcico as heterozygous state of gene allow aclcino effect and it is x chromosome linked.

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