In a female labrador retriever diploid a single nondisjuncti

In a female labrador retriever (diploid) a single nondisjunction event of chromosome 7 occurs in meiosis II. What are the genotypes of the gametes produced from this?

Solution

During the process of meiosis, the chromosomes do not separate properly and results in the condition called non-disjunction and end up in the abnormal number of chromosomes. The resulting 1/4 of the gametes will be n+1 (trisomy), 1/4 of the gametes will be n-1 (monosomy) and 1/2 of the gametes will be n.

The genotypes of the gametes will be

n+1

n-1

n

n

777

7

77

77

During the process of meiosis, the chromosomes do not separate properly and results in the condition called non-disjunction and end up in the abnormal number of chromosomes. The resulting 1/4 of the gametes will be n+1 (trisomy), 1/4 of the gametes will be n-1 (monosomy) and 1/2 of the gametes will be n.

The genotypes of the gametes will be

n+1

n-1

n

n

777

7

77

77

During the process of meiosis, the chromosomes do not separate properly and results in the condition called non-disjunction and end up in the abnormal number of chromosomes. The resulting 1/4 of the gametes will be n+1 (trisomy), 1/4 of the gametes will be n-1 (monosomy) and 1/2 of the gametes will be n.

The genotypes of the gametes will be

n+1

n-1

n

n

777

7

77

77

n+1	n-1	n	n
777	7	77	77 During the process of meiosis, the chromosomes do not separate properly and results in the condition called non-disjunction and end up in the abnormal number of chromosomes. The resulting 1/4 of the gametes will be n+1 (trisomy), 1/4 of the gametes will be n-1 (monosomy) and 1/2 of the gametes will be n. The genotypes of the gametes will be n+1 n-1 n n 777 7 77 77 During the process of meiosis, the chromosomes do not separate properly and results in the condition called non-disjunction and end up in the abnormal number of chromosomes. The resulting 1/4 of the gametes will be n+1 (trisomy), 1/4 of the gametes will be n-1 (monosomy) and 1/2 of the gametes will be n. The genotypes of the gametes will be n+1 n-1 n n 777 7 77 77