Question

a pedigree chart uses specific symbols to indicate presence or absence of a genetic trait in members of a family. horizontal lines connect mating pairs and vertical lines connect to the offspring of each mating pair. squares represent xy individuals and circles represent xx individuals. a filled (red) figure exhibits the trait, whereas an unfilled (tan) figure does not exhibit the trait. a pedigree chart helps visualize patterns of inheritance and expression of a trait through several generations of a family.
use the labels to identify the family member or pair of family members in this pedigree that match each description.
mating pair
male who does not have the trait
mother and son
male who has the trait
answer bank
4 and 10 7 13
5 and 6

Explanation:

• Mating pair: Horizontal lines connect mating pairs. In the pedigree, \(5\) and \(6\) are connected by a horizontal line, so they are a mating pair.
• Male who does not have the trait: Squares represent \(XY\) (male) individuals. Un - filled (tan) squares do not have the trait. Individual \(7\) is a tan square, so \(7\) is a male who does not have the trait.
• Mother and son: Circles represent \(XX\) (female) individuals (mothers) and squares represent \(XY\) (male) individuals (sons). Individual \(4\) (circle) and \(10\) (square) are a mother - son pair.
• Male who has the trait: Squares represent \(XY\) (male) individuals. Filled (red) squares have the trait. Individual \(13\) is a red square, so \(13\) is a male who has the trait.

Answer:

• mating pair: \(5\) and \(6\)
• male who does not have the trait: \(7\)
• mother and son: \(4\) and \(10\)
• male who has the trait: \(13\)