Pedigrees and Sex-linked Traits

Question 1

Inheritance of Traits

Answer 1

• herdity helps us track and analyze inheritance of traits
• if a child has recessive phenotype, we know both parents have heterozygous genotype for that trait
• called “carriers”

Question 2

Pedigree Charts

Answer 2

• simplest way to visually follow the inheritance of a gene
• type of family tree
• races the inheritance of a certain trait among members of a family

Question 3

order of Pedigree Charts

Answer 3

• very ordered and give us specific information about the family
• generation in identified by a Roman numeral
• Each individual within the generation is a number l where 1 is always the oldest child
• drawn from left to right

Question 4

Genetic Counsellors

Answer 4

• construct and analyze pedigrees to help trace the genotypes and phenotypes of a family
• used to determine if and how any particular trait runs in a family

Question 5

Plant and Animal Breeders

Answer 5

• used to track both desirable and undesirable traits
• for example, mating 2 race horses to proucde offsrping with favorable genes/ traits

Question 6

Autosomal Inheritance

Answer 6

• allee inhearited on a chromosome is also known as under the control of autosomal inheritance
• ## effects both sexes equally and is not effected by the inheritance of sex chromosomes

Question 7

Sex Linked Traits

Answer 7

• ## if an allele is on one of the sex chromosomes, the gender of the individuals will effect the inheritance of this trait

Question 8

Sex-Linked: X Linked

Answer 8

• genetic disorder carried on the X chromosome
• males are likely to inherrite reccive disorder
  Female: X^R X^r= unaffected
  Male: X^r Y= affected
• A father also cannot pass an X–linked trait to his sons, only his daughters

Question 9

Sex-Linked: Y-Linked

Answer 9

• can only be passed from father to son
• fewer y linked because y chromosome are smaller than x chromosome
• Y-linked disorders may cause reduced fertility in males and may require medical intervention