Theme 4a Pt 2

Question 1

What is incomplete dominance

What is codominance

Answer 1

Intermediate phenotype (blending) since one allele is not completely dominant to other allele.

Both traits are expressed, dominant alleles fight for expression

Question 2

What does it mean when traits are polygenic

Answer 2

Multiple genes are responsible for contributing to one particular trait

Ex. Length of corn ears

More dom alleles give longer ear of corn

Question 3

What is a monohybrid cross

Answer 3

Cross between two heterozygotes

Question 4

How is the probability of a genotype in a cross determined

Answer 4

By multiplying the probabilities of getting each gamete from mother and father

Question 5

If something is heterozygous how many types of gametes does it make

What about homozygous

Answer 5

Two types (two alleles are diff)

One type (two alleles are the same)

Question 6

What is a test cross

Answer 6

Mating to an individual with a homozygous recessive genotype (a/a)

Question 7

What is incomplete dominance

Answer 7

Intermediate phenotype, one allele isn’t completely dominant to other allele

There is a functional enzyme and a non functional, the plants make some functional enzyme but not enough so we get intermediate phenotype

Use superscript to label the alleles

Question 8

What is codominance

Answer 8

Alleles have equal effects (dominant alleles fight for expression)

The heterozygote shows both homozygote phenotypes at same time (speckled)