Morgan's Experiments on Drosophila
Trending Questions
- located very far on the same chromosome
- located very near on the same chromosome
- present on different chromosomes
- located on autosomes
Sex chromatin are present in
Drumstick-like in lobe of lymphocyte
Drumstick-like in lobe of eosinophil
Drumstick-like in lobe of neutrophil
Drumstick-like in lobe of basophil
Reason (R): In Drosophila, the gene responsible for eye colour is more closely located to the gene for body colour as compared to the gene for wing size.
[0.7 mark]
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Mr. Joseph crosses a heterozygous red eyed female Drosophila with a white eyed male. What will be the characters of males and females after F1 generation respectively?
- red eyed females and white eyed males
- white eyed females and red eyed males
- 50% red and 50% white eyed females and 100% white eyed males
- 50% red and 50% white eyed female as well as males
- Eosin > red > white
Red > eosin > white
White > red > eosin
Eosin > white > red
Which of the following traits is sex-linked in Drosophila?
Eye color
Brown body
Curly wings
Body length
- False
- True
- The person from whom the trait starts is known as the proband.
- A solid geometrical figure is used to indicate an unaffected individual.
- It is very useful during genetic counselling of married couples.
- It is an analysis of a trait that has run through several generations of a family.
1) The genes responsible for white eye color and that for yellow body were very ____i____ linked. _____ii____ of the F2 generation had parental phenotype while __iii_______ of F2 offsprings had the recombinant phenotype.
2) The genes responsible for white eye color and that controlling miniature wings were ___iv_____ linked. Percentage of F2 progenies showing parental and recombinant phenotypes were ____v_____ and ____vi_____ respectively.
- i-loosely, ii-1.3%, iii-98.7%, iv-loosely, v-62.8%, vi-37.2%
- i-loosely, ii-98.7%, iii-37.2%, iv-loosely, v-62.8%, vi-1.3%
- i-tightly, ii-1.3%, iii-37.2%, iv-loosely, v-62.8%, vi-98.7%
- i- tightly, ii-98.7%, iii-1.3%, iv-loosely, v-62.8%, vi-37.2%
- 0.5 million
- 1 million
- 2 million
- 0.25 million
- 100%
- 25%
- 50%
- Nil
- Male Drosophila : red eyes :: female Drosophila : brown eyes
- Male Drosophila : brown eyes :: female Drosophila : red eyes
- Male Drosophila : white eyes :: female Drosophila : red eyes
- Male Drosophila : brown eyes :: female Drosophila : brown eyes
1) The genes responsible for white eye color and that for yellow body were very ____i____ linked. _____ii____ of the F2 generation had parental phenotype while __iii_______ of F2 offsprings had the recombinant phenotype.
2) The genes responsible for white eye color and that controlling miniature wings were ___iv_____ linked. Percentage of F2 progenies showing parental and recombinant phenotypes were ____v_____ and ____vi_____ respectively.
- i-tightly, ii-1.3%, iii-37.2%, iv-loosely, v-62.8%, vi-98.7%
- i-loosely, ii-1.3%, iii-98.7%, iv-loosely, v-62.8%, vi-37.2%
- i-loosely, ii-98.7%, iii-37.2%, iv-loosely, v-62.8%, vi-1.3%
- i- tightly, ii-98.7%, iii-1.3%, iv-loosely, v-62.8%, vi-37.2%
Which of the following traits is sex-linked in Drosophila?
Eye color
Leg size
Curly wings
All of these
- 50%
- 25%
- Zero
- 100%
- Breeds easily
- Breeds faster
- Parthenogenetic
- Fewer
chromosomes - More offsprings
- Easily available
- Distinct sex
- Haploid body
In Drosophila, white eye color is a recessive X-linked trait while red eye color is dominant. A white-eyed female is crossed with a red-eyed male. The female offspring with red eye color would be
100%`
50%
25%
zero
Why is man unable to pass on a sex-linked gene to his son?
- Male Drosophila : red eyes :: female Drosophila : brown eyes
- Male Drosophila : brown eyes :: female Drosophila : red eyes
- Male Drosophila : white eyes :: female Drosophila : red eyes
- Male Drosophila : brown eyes :: female Drosophila : brown eyes
- Mutations
- Recessive alleles to come together
- Multiple births
- Blood group abnormalities
- Red-eyed females and white-eyed males in the F1
- White-eyed females and red-eyed males in the F1
- Half red and half white-eyed females and all white eyed males in the F1
- Half red and half white-eyed females as well as males in the F1
Write the symbol of mother genotype.
- Breeds easily
- Breeds faster
- Parthenogenetic
- Fewer
chromosomes - More offsprings
- Easily available
- Distinct sex
- Haploid body
- The person from whom the trait starts is known as the proband.
- A solid geometrical figure is used to indicate an unaffected individual.
- It is very useful during genetic counselling of married couples.
- It is an analysis of a trait that has run through several generations of a family.
- Double recessive allele
- Dominant allele
- Homozygous deficiency
- Heterozygous deficiency
- 50% daughters will be green and 50% sons will be rosy
- All offspring will be green irrespective of sex
- All the daughters will be green and all the sons will be rosy
- All offspering will be rosy irrespective of sex
Which of the following traits is sex-linked in Drosophila?
Eye color
Leg size
Curly wings
All of these
- False
- True
- All blue-eyed
- Three blue-eyed and one brown-eyed
- All brown-eyed
- One blue-eyed and one brown-eyed