Question

Can someone please help and explain what I'm doing wrong.

The translocation carrier parent does not have Down syndrome because he or she has a total of two copies of chromosome 21. Suppose that a woman is a translocation carrier of chromosome 21 on chromosome 14. She conceives six zygotes with a normal man who carries no aneuploidies. Match the description of the chromosomes inherited by each zygote with the viability of the zygote. Viable normal, or translocation carrier Viable, with Down syndrome Inviable two normal copies of 21, two normal copies of 14 one 21 to 14 translocation, two normal copies of 21, one normal copy of 14 one normal copy of 21, two normal copies of 14 one normal copy of 21, one 21 to 14 translocation, one normal copy of 14 one normal copy of 14, two normal copies of 21 two normal copies of 14, one normal copy of 21, one 21 to 14 translocation Answer Bank

Answer 1

the genotype of the translocation carrier is 14, 21, 14/21

the possible gametes are (14,21), (14/21), ( 21), ( 14, 14/21), ( 14), (21, 14/21).

if these gametes are fertilized with normal sperm genotype of the offspring are

(14,21,14,21)- normal, viable

(14/21,14,21)- viable, carrier of Robertsonian translocation

( 21, 21,14)- monosomy of 14, not viable.

( 14, 14/21,14, 21)- trisomy of 14, not viable

( 14, 14,21)-monosomy of 21, not viable

(21, 14/21,14, 21)- Down syndrome, viable

Viable normal, or translocation carrier Viable, with Down syndrome Inviable two normal copies of 21, two normal copies of 14 one 21 to 14 translocation, two normal copies of 21, one normal copy of 14 one normal copy of 14, two normal copies of 21 one normal copy of 21, one 21 to 14 translocation, one normal copy of 14 one normal copy of 21, two normal copies of 14 two normal copies of 14, one normal copy of 21, one 21 to 14 translocation