Genetics HELP?

Question

1) The primrose, primula kewensis, has 36 chromosomes that are similar in appearance to the chromosomes in two related species, primula floribunda (2n=18) and primula verticillata (2n=18). how could P. kewensis arise from these species? how would you describe P. kewensis in genetic terms?

2) Drosophila may be monosomic for chromosome 4 and remain fertile. contrast the F1 and F2 result of the following crosses involving the recessive chromosome 4 trait bent bristles : a) monosomic IV, bent bristles x diploid, normal bristles
b) monosomic IV, normal bristles x diploid, bent bristles

Answer 1

1) Primula kewensis is an allotetraploid formed by a hybridization event followed by a polyploidization event. Its parent species are Primula floribunda and Primula verticillata.

2a) F1; all normal bristles. F2; 75% normal, 18.75% bent, 6.25% lethal.

2b) F1; 50% normal, 50% bent. F2; 43.75 normal, 50% bent, 6.25% lethal.

Answer 2

Good question. I would agree agresivness is a dominant trait , and tempament is inherited from the parents . In saying it is a dominant trait, it also means that this would be the trait inherited from the parent , rather than say the submissive trait from the other parent . As some one else said , sometimes (and only sometimes) genetic traits can be overcome with goood traing etc , other times this is just not the case

Answer 3

Primula Kewensis

Answer 4

thanks!