19. Genetics & Inheritance

How many chromosomes does a person who is a carrier for familial down syndrome caused by a Robertsonian translocation have?

An individual heterozygous for a reciprocal translocation has the following chromosomes. Which chromosomes do the gametes receive after adjacent-1 segregation? 

A B • C D E F G        J K • L M N O P 

A B • C D N O P       J K • L M E F G 

An individual heterozygous for a reciprocal translocation has the following chromosomes. Which chromosomes do the gametes receive after adjacent-2 segregation? 

A B • C D E F G      J K • L M N O P 

A B • C D N O P      J K • L M E F G 

Which of the following represents the chromosomal segregation into gametes after a reciprocal translocation caused by adjacent-1 segregation? N=Normal chromosome T = Translocated chromosome

Which of the following ways reciprocal translocated chromosomes are sorted produces viable gametes?

An individual heterozygous for a reciprocal translocation has the following chromosomes. Which chromosomes do the gametes receive after alternative segregation? 

A B • C D E F G            J K • L M N O P 

A B • C D N O P           J K • L M E F G