Question

PROCEDURE: Analysis of a pedigree The most common type of color blindness is red-green Coreessive color perception defeet. It's due to a blind allele). X-linked red-green have normal vision, but mutation on the X chromosome (i.e. a red-green color color blindness is a recessive trait. Females heterozygous are carriers of the trait. The color perception defect man inherited from both parents (homozygous recessive). Byor blind if the inenedigree c chromosome from their mothers and become red-green color chromosome has the color perception defect. A four generation is diagrammed in Figure 18.2 s only when it is ozygous recessivel. By contrast, males inherit their single x for this trai ifests itself in female blind if the inherited X color blindness pedigree chart female female -carrier female affectecd ?male male affected Figure 18.2 Diagram the cross between the male and female in couple "a" on the pedigree. Note: Use the following: XR- normal vision; X' - red-green color perception defect 1. gamete alleles 2. Assume that the female at "b" married a male with normal vision. Diagram the cross gamete alleles

Answer 1

1) Because he has only one x cromosome 2) Because disease is receive and require two receive allow to show affect. 3) Homozygous 4) Homozygous receive.