Inheritance- diagrams

Question 1

What is Mendel’s 1st law of segregation?

Answer 1

-Alternate versions of genes (alleles) cause variation in inherited charcteristics
-An organisim inherits two alles for each charcteristics- one from each parent
-Dominant alleles will always mask ressecive alleles
-Two allels for each charcteristic separate during gamate production

Question 2

What is Mendel’s 2nd law?

Answer 2

-The law of independent assortment
-Genes for different characteristics are sorted independently during gamete production

Question 3

How do you set out a genetic diagram?

Answer 3

Alleles

Mother (p1)
Farther (p2)

Genotype and phenotype for each

Question 4

What are some signs that inheritance is dominant when interpreting pedigree diagrams?

Answer 4

-Traits do not skip a generation
-An affected person married to a normal person should have approximately 50% of offspring’s being effected if the other person is heterozygous
-An affected person married to a normal person should have approx. 100% of the offspring affected if the affected individual is homozygous dominant

Question 5

What are some signs that inheritance is recessive when interpreting pedigree diagrams?

Answer 5

-Traits often skip a generation
-If both parents are affected all the children should be affected person all the children are normal if the other person is homozygous dominant
-If a normal person is married to an affected individual then approx. half of the children should be effected if the other person is heterozygous

Question 6

How do you work out an unknown genotype?

Answer 6

-Cross test with a known genotype

Question 7

Define codominance

Answer 7

When two different alleles of a single gene are both individually and equally expressed to produce a phenotype where both of the parental phenotypes appear together