CH12 Genetics and evolution

Question 1

Dominant vs Recessive

stuff used for heterozygous:

• Incomplete dominance

Answer 1

• Dominant: only one copy of an allele (chromosome) is needed to express a given phenotype
• Recessive: Two copies are needed to express the phenotype
• Incomplete dominance: i.e HH (long tail) x hh (short tail) = Hh (medium tail)

Question 2

nucleotide level mutations

Answer 2

Question 3

Hardy-Weinberg principle

Answer 3

p + q = 1

p² + 2pq + q² = 1

(p² = TT , 2pq = Tt , q² = tt)

Question 4

Divergent, Paralell, and convergent evolution

Answer 4

Divergent: species sharing a common ancestor become more different

Parallel: species sharing common ancestor evolve in similar ways due to similars pressures

Convergent evolution: species not sharing a recent ancestor evolve to become more similar