13. Mendelian Genetics

Pedigrees

GCSE Biology - Family Trees / Family Pedigrees #74

How to Read Pedigrees

What are Pedigree Charts

 Both his paternal grandfather and his paternal grandmother have widow's peaks. 

 No. Because the widow's-peak trait is dominant, this would not tell you whether his father is homozygous or heterozygous. 

 No. She must have inherited the widow's peak allele from her father, but this would not help determine whether the father is homozygous or heterozygous for the trait. 

 The son's own daughter lacks a widow's peak. 

 No. This would tell him that he is heterozygous for the trait but would say nothing about his father. 

 The son submits his own blood sample to a local genotyping lab, and it establishes that he is heterozygous for the trait. 

 No. It was already clear that he was heterozygous because his mother is homozygous recessive. 

 His father's mother lacks a widow's peak. 

Draw a pedigree of the family and assign as many genotypes as you can.

A man has a pointed frontal hairline known as a widow's peak. This trait is thought to be controlled by a dominant allele. His wife lacks a widow's peak, and their son has a widow's peak. (W: widow's peak; w: no widow's peak). The son is curious about whether his father is homozygous or heterozygous for the widow's peak trait. Which of the following facts would allow him to know?

Pedigrees | Classical genetics | High school biology | Khan Academy

When a trait is highly heritable,                   .
a. it is influenced by genes;
b. it is not influenced by the environment;
c. the variance of the trait in a population can be explained primarily by variance in genotypes;
d. A and C are correct;
e. A, B, and C are correct

 No. Carriers, who do not have the disease, are represented by open symbols or by half-shaded symbols. 

 No. Males are represented by squares and carriers by open or half-shaded symbols. 

 No. Males are represented by squares, and shading does not indicate that the genotype is unknown. 

How are different people represented on a pedigree?

Tay-Sachs disease runs in Rebecca's family. On a family pedigree, she saw a shaded circle. This represented a __________.

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