Question 10 For the cross Ll x LL choose the genotypic ratio [ Select ] [\"1LL:2

Question

Question 10

For the cross Ll x LL choose the genotypic ratio                            [ Select ]                       ["1LL:2Ll:1ll", "1LL:1Ll", "1LL:0ll", "0LL:1ll"]         and the phenotypic ratio

Question 11

For the cross ll x ll choose the genotypic ratio                            [ Select ]                       ["1Ll:1ll", "1LL:2Ll:1ll", "3Ll:1ll", "0LL:0Ll;1ll"]         and the phenotypic ratio                            [ Select ]                       ["3L:1l", "1L:1l", "1L:0l", "0L:1l"]

Question 12

Explain how two flies with normal wings have offspring with vestigial wings.

Question 13

You mate two gray normal winged flies and get offspring which are all gray but 25% of them have vestigial wings. What are the genotypes of the flies you mated? Explain your answer.

Question 14

Explain how many phenotypes are there for a trait that has two alleles that are governed by incomplete dominance.

Question 15

Explain how many phenotypes are there for a trait that has two alleles that are governed by co- dominance.

Explanation / Answer

Question 10:-             Ll x LL

Genotypic ratio:-         1 LL : 1 Ll

Phenotypic ratio:- all offsprings will have dominant phenotype

Question 11:- ll x ll

Genotypic ratio:-         0LL : 0Ll: 1ll

Phenotypic ratio:-       0L : 1l All offsprings will have recessive phenotype

Question 12:- let the V (dominant) allele produces normal wings, whereas the v (recessive) allele produces vestigial wings. If the parents are heterozygous, they will exhibit long wings but offspring with recessive alleles will produce vestigial winds

Parents:                               Vv   x Vv

Offsprings:                      1VV : 2Vv   :   1vv

VV= Normal wings

Vv= Normal wings

vv= Vestigial wings

Question 13:- if G is dominant allele for gray colour while V and v are dominant and recessive allele for normal and vestigial wings respectively. In the above situation, the parents are homozygous dominant for GG and heterozygous for wings Vv

Parents:                               GGVv   x GGVv

Offsprings:                       25% GGVV : 50%GGVv   :   25% GGvv

GGVV= Gray colour Normal wings

GGVv= Gray colour Normal wings

GGvv= Gray colour Vestigial wings

Question 14:- Incomplete dominance exhibit Three phenotypes

e.g., In Mirabilis jalapa plant R1 and R2 are incomplete dominant alleles

Parents:                               R1R1 x R2R2

Offsprings:                          1R1R1 : 2R1R2 : 1R2R2

R1R1 = red flower and

R2R2 = white flower

R1R2 = Pink flower (intermediate phenotype related to the parental phenotype)

Question 15:- Co-dominance exhibit Three phenotypes, e.g., In humans M and N are codominant alleles determining M-N blood group

Parents:                               MM x NN

Offsprings:                          1MM : 2MN : 1NN

MM = M blood group

NN = N blood group

MN = MN blood group ( Phenotype distinctly different from either of the homozygous genotype)

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