Human Chromosomes

How is a karyotype made?

• A Punnett square

• A.   A series of X-diffraction images

• A.   A photograph of cells in metaphase of mitosis

• A.   A preparation of gametes on a microscope slide

A karyotype chart can indicate which of the following?

I. Gender

II. Non-disjunction of chromosomes

III. Patterns of inheritance

• I only

• I and II only

• I and III only

• I, II and III

A normal human karyotype contains ___________.

 

• 22 autosomes and 2 sex chromosomes

• 44 autosomes and 2 pairs of sex chromosomes

• 23 pairs of autosomes and 1 pair of sex chromosomes

• 22 pairs of autosomes and and 1 pair of sex chromosomes

If nondisjunction occurs during meiosis, what would be the result? 

   

• Two gametes produced instead of four

• Gametes with abnormal number of chromosomes

•   Gametes with complete genomes

• Gametes can’t join

Which of the following is true for Down Syndrome?

I. Caused by nondisjunction in autosomes

II. result of an extra chromosome 21

III. called trisomy 21

• I only

• I, II only

• I, III only

• I, II and III

What disease is a result of one chromosome  lacking?                                     

         

• Klinefelter syndrome

• Turner's syndrome

• Down syndrome

• color blindness

A condition resulting from one extra sex chromosome?                                   

   

• Klinefelter syndrome

• Turner's syndrome

• Down syndrome

• sickle cell anaemia

What is the name given to the type of error that is occurring in the father during the process of meiosis as shown in the diagram?

• trisomy

• nondisjunction

• karyotype

Predict the number of chromosomes in the zygote that will result from the fertilization of gametes number 1 and 2.

• 23 chromosomes

• 45 chromosomes

• 46 chromosomes

• 47 chromosomes

Colorblindness is a a result of

• codominance

• dominant genes

• multiple alleles

• sex linked inheritance