12.1

Question 1

Describe explanations for inheritance prior to Mendel.

Answer 1

Traits in offspring were thought to be a blending of traits from both parents

Question 2

Explain the advantages of Mendel’s experimental system.

Answer 2

Since the pea plants could self fertilize, its allowed for cross-fertilization. This enabled mathematical analysis of his observations which made it easier to predict the outcome of the offspring’s traits

Question 3

Outline Mendel’s experimental crosses

Answer 3

cross 2 true-breeding strains

Question 4

Explain Mendel’s Principle of Segregation.

Answer 4

o 2 alleles for a gene segregate during gamete formation & are rejoined @ random, one from each parent, during fertilization
 Physical basis for allele segregation is the behavior of chromosomes during meiosis

Question 5

Compare the segregation of alleles with the behavior of homologues in meiosis.

Answer 5

Both alleles originate at the beginning and at end they separate into different gametes

Question 6

Compare dominant vs. recessive inheritance of human traits

Answer 6

o Dominant: BB/Bb- will show as long as there is one dominant allele
o Recessive: rr- only shows if there are 2 recessive alleles