Unit 6

Question 1

what is the 50/50 rule

Answer 1

each parents contribute 1/2 of the chromosomes to the offspring

Question 2

What does a pedigree like like with a dominate trait

Answer 2

shows in every generation unless recessive pair up on both sides

Question 2

what does a pedigree look like with a recessive trait

Answer 2

usually recessive trait “dissapears” in F1 generation

Question 3

hereditary

Answer 3

transmission of traits from parents to offspring

Question 3

alleles

Answer 3

different form of one gene

Question 4

mutation

Answer 4

random events that change the sequence of a gene and therefore create a new allele

Question 5

traits

Answer 5

a physical characteristic

Question 6

genotype

Answer 6

the genetic makeup of an organism

Question 7

phenotype

Answer 7

the physical appearance of an organism as a result of the genotype

Question 8

monohybrid cross

Answer 8

used to show how one trait is inherited and its probability of occurence

Question 9

complete dominance

Answer 9

one allele completely masks the other

Question 10

how many phenotypes are possible for complete dominance

Answer 10

2

Question 11

how many phenotypes are possible with incomplete dominance

Answer 11

3

Question 12

incomplete dominace

Answer 12

when a combination of the dominate and recessive alleles creates a new phenotype

Question 13

codominance

Answer 13

a single gene has more than one dominate allele

Question 14

how many possible phenotypes are there with codominance

Answer 14

3

Question 15

multiple alleles

Answer 15

many gene exist as multiple alleles and exhibit several different forms

Question 16

how many possible phenotypes are there with multiples alleles

Answer 16

4

Question 17

sex-linked inheritance

Answer 17

sex chromosome determines weather or not a certain trait is inherited

Question 18

polygenic traits

Answer 18

many traits are controlled by more than one gene, allows them to show a wide range of phenotypes

Question 19

dihybrid cross

Answer 19

used to show how two traits are inherited, and their probability of occurence