Lec 14

Question 1

Mendel’s Laws of Inheritance Have Exceptions

Answer 1

Some traits have other mechanisms that
affect their inheritance!

Question 2

Mendel’s concept of dominance

Answer 2

The heterozygote has the same phenotype as the homozygote dominant

Question 3

Flowering time was used to find

Answer 3

Incomplete dominance- intermediate between two homozygotes (medium flowering time instead of long or short)

Question 4

Incomplete dominance phenotypic ratios

Answer 4

1:2:1 (F2 generation)

Question 5

Penetrance and polydactyly

Answer 5

Caused by a dominant allele

P+ is normal allele

Extra fingers/toes found P+Px(heterozygotes)

Across the large number of heterozygotes only some of them have extra fingers and toes

Question 6

Incomplete penetrance

Answer 6

the percentage
of individual organisms having
a particular genotype that
express phenotype

Question 7

Expressivity

Answer 7

The degree to which a trait is expressed

Question 8

Penetrance and expressivity are due to

Answer 8

Effects of other genes and environmental factors

Question 9

Two genes can regulate

Answer 9

Two independent characteristics

Question 10

Some genes interact to regulate

Answer 10

specific phenotypes

Question 11

Gene interaction

Answer 11

Interaction between the effects of genes on different loci

Question 12

Gene interactions refers to

Answer 12

Dihybrid crosses

Question 13

If genes are unlinked

test cross

Dihybrid cross

Answer 13

Mendel states we can break the two genes into two punnett squares