chp3 inheritance and variation

Question 1

monohybrid cross?

Answer 1

crossing of 2 pure pl. differing one contrasting character

Question 2

monohybrid cross phenotypic ratio?

Answer 2

3:1

Question 3

monohybrid cross genotypic ratio

Answer 3

1:2:1
TT:Tt:tt

Question 4

dihybrid cross?

Answer 4

cross between 2 homozygous parents differing 2 contrasting characs.

Question 5

phenotypic ratio of dihybrid cross?

Answer 5

9:3:3:1

Question 6

genotypic ratio of dihybrid cross?

Answer 6

1:2:2:4:1:2:1:2:1

Question 7

law of dominance

Answer 7

when 2 homozygous indivs w 1 or more sets of contrasting characs are crossed the characs that appear in f1 generation are dominant and those do not appear are recessive

Question 8

monohybrid test cross ratio ?

Answer 8

1:1

Question 9

inc dominance

Answer 9

one gene form a pair of alleles is not completely dominant over other

Question 10

inc dominance eg:

Answer 10

mirabalis jalapa 4O’clock pl.

Question 11

phenotypic and genotypic ratio of inc dominance

Answer 11

1:2:1

Question 12

co dominance

Answer 12

the alleles of a pair expresses themselves equally

Question 13

phenotypic and genotypic ratio of co-dominance

Answer 13

1:2:1

Question 14

eg of co dominance

Answer 14

cattle red and white
roan

Question 15

multiple alleles eg

Answer 15

drosophila and abo system in humans

Question 16

drosophila wings

Answer 16

normal wings Vg+
nicked wings vg^n
notched wings vg^no
strap wings vg^st
vestigial wings vg

Question 17

pleiotropy

Answer 17

single gene consists 2 or more diff traits

Question 18

pleiotropy ratio

Answer 18

2:1

Question 19

eg of pleiotropy

Answer 19

sickle cell anaemia

Question 20

sickle cell anaemia ratio

Answer 20

1:2:1

Question 21

polygenic inheritance

Answer 21

characs are determined by 2 or more gene pair

Question 22

ratio of cumulative genes, polygenes, multiple factors

Answer 22

additive effect: 1:4:6:4:1
3 genes 1:6:15:20:15:6:1

Question 23

carrier of genes?

Answer 23

chr.

Question 24

carrier of all hereditary characs

Answer 24

gametes sperms and eggs

Question 25

link between parents and offsprings

Answer 25

gametes

Question 26

ploidy of somatic cells that develop in zygote

Answer 26

2n