Genetics Section 2

Question 1

the laws of probability predict what _____ will occur, not what ____ occur

Answer 1

likely, will

Question 2

give an ex of probability

Answer 2

tossing a coin

Question 3

a chart that shows all the possible combinations of alleles that can result from a genetic cross. This also determines the probability of a particular outcome.

Answer 3

Punnett square

Question 4

an organisms physical appearance (or traits) is called

Answer 4

phenotype

Question 5

an organisms genetic makeup (alleles) is called

Answer 5

genotype

Question 6

what term is used to describe an organisms whose genotype consists of 2 identical alleles (TT)?

Answer 6

Homozygous

Question 7

what term is used to describe an organisms whose genotype consists of 2 different alleles (Tt)?

Answer 7

heterozygous

Question 8

explain how 2 organisms can have the same phenotype but different genotypes?

Answer 8

2 organisms can show the trait of brown hair but one organism can have the alleles BB and the other organism can have the alleles of Bb. Genotype is BB and Bb and phenotype is brown hair.

Question 9

When an offspring who’s alleles from both parents that is called (this means the genetics are not following Mendel’s work)

Answer 9

co-dominance

Question 10

Give an ex of codominance

Answer 10

codominance is when an organism shows both the parents’ traits. A white hen can crossbreed with a black rooster. Each offspring can have colors black and white. The trait do not blend to make gray.

Question 11

what is incomplete codominance?

Answer 11

when a trait blends in an offspring (white flower breeds with red flower and the offspring is pink)