Relationships in a pedigree are shown as a series of lines. Parents are connected by a horizontal line and a vertical line leads to their offspring. The offspring are connected by a horizontal sibship line and listed in birth order from left to right.
What is a offspring in a pedigree?
Offspring Line: Vertical line from the center of the mating line to the center of the offspring symbol or to the sibling line. 1 male child. Children from a previous partner (stepchildren). Mike and Jane have one son, and Jane has a daughter from a previous marriage.
What pattern of inheritance does this pedigree chart represent?
The correct answer is an X-linked recessive trait.
What is the purpose of a pedigree?
A pedigree can be used to determine disease inheritance patterns within a family. Standard pedigree nomenclature. Common symbols are used to draw a pedigree (family tree). A pedigree shows relationships between family members and patterns of inheritance for certain traits and diseases.
What do circles represent in a pedigree?
In a pedigree, a circle represents a female, and a square represents a male. A filled-in circle or square shows that the individual has the trait being studied. The horizontal line that connects a circle and a square represents a marriage.
How many generations are shown in this pedigree?
(7.4) Pedigree flashcards
|How many generations are shown on this pedigree?,||3 generations are shown.|
|Which individual is a female affected by the trait of interest?,||I-2 is the affected female.|
|Which individual is a male affected by the trail of interest?,||III-2 is the affected male.|
What are the 4 modes of inheritance?
Several basic modes of inheritance exist for single-gene disorders: autosomal dominant, autosomal recessive, X-linked dominant, and X-linked recessive. However, not all genetic conditions will follow these patterns, and other rare forms of inheritance such as mitochondrial inheritance exist.
What is the name of this inheritance pattern?
The most common inheritance patterns are: autosomal dominant, autosomal recessive, X-linked dominant, X-linked recessive, multifactorial and mitochondrial inheritance. “Autosomal” refers to traits determined by the genes located on the autosomes.
What is an example of heterozygous?
If the two versions are different, you have a heterozygous genotype for that gene. … For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair. The relationship between the two alleles affects which traits are expressed.
What are the characteristics of a dominant pedigree?
Characteristics of autosomal dominant traits: –Every affected person has at least one affected parent. -When the trait (or disease) is rare in the population, shows vertical pattern of inheritance in the pedigree (affected males and females in each generation).