Suppose you are carrying out a series of crosses with an insect where the mechanism of determination is unknown. you discover a mutant female with short wings and decide to cross it with a wild-type male that has normal wings. none of the f₁ progeny have short wings but among the f₂ progeny 26% have short wings. however, all of these short-winged f₂ progeny are females. based on these results, a valid hypothesis would be . females are xx. males are xy and black wing scales are caused by n recessive allele on the x chromosome b. females are xx. males are xy and black wing scales are caused by a dominant allele on the x chromosome. c. females are zw. males are zz and black wing scales are caused by a recessive allele on the z chromosome. d. females are zw, males are 11 and black wing scales are caused by a dominant allele on the z chromosome.

The distribution of related animals and plants across the world

The punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. in this cross, tallness (h) is dominant to shortness (h). based on the punnett square, what is the phenotype of the offspring? hh hh tall short

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)