Joe is color blind. Both his mother and his father have normal vision, but his mother’s father (Joe’s maternal grandfather) is color blind. All Joe’s other grandparents have normal color vision. Joe has three sisters— Patty, Betsy, and Lora—all with normal color vision. Joe’s oldest sister, Patty, is married to a man with normal color vision; they have two children, a 9-year-old color-blind boy and a 4-year-old girl with normal color vision. Q. If Patty and her husband have another child, what is the probability thatthe child will be a color-blind boy?

HITCHHIKER'S THUMB: The distal (last) joint of the thumb can be bent back to forma 45 degree angle with the proximal joint (attached to your hand) if you arehomozygous recessive (hh) for this trait.Michael has a well-developed hitchhikers thumb, but neither of his parents show thetrait. If his parents have another child, what is the probability that he/she will alsohave a hitchhikers thumb?

Make sure to show if it is big (Y) or little (y) Big (S) or little (s) it is so hard to understand if you write it in paper. Please, help me

A young boy is colorblind. His one brother and five sisters arenot. The boy has three maternal uncles and four maternal aunts.None of his uncles's children or grandchildren are colorblind. Oneof the maternal aunts married a colorblind man, and half of herchildren, both male and female, are colorblind. The other auntsmarried men who have normal color vision. All their daughters havenormal color vision, but half of their sons are colorblind.1. Which of the boy's four grandparents transmittied the gene forcolorblindness?2. Are any of the boy's aunts and uncles colorblind?3. Are either of the boy's parent colorblind?

Colorblindness is an X linked gene. Normal vision (XN ) is dominant over colorblind (Xn). Cross a carrier female to a normal male. How many of their children will be colorblind? How many of their sons will be colorblind? How many of their daughters will be colorblind?

Thick mucous gland secretions, elevated sweat electrolytes, meconium ileus, and difficulty maintaining and gaining weight are associated with which autosomal recessive disorder? Cerebral palsy. Cystic fibrosis Muscular dystrophy. Multiple sclerosis

Frank and Susan both have freckles but they're firstborn son Lawrence does not demonstrate the characteristics. What are the most likely genotype of Frank Susan and Lawrence?

D. In man, a certain type of deaf mutism is recessive. Let (D) be normal and (d) be deaf-mute.  A normal, right-handed man married a normal, right-handed woman.  They had a child who was a left-handed deaf-mute.