Course Content
History of genetics
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Extra-nuclear inheritance – genes in organelles, maternal effect, criteria for extra-nuclear inheritance
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Mutation – genic, chromosomal and molecular levels
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Learn Introductory Genetics with Rahul

Sex expression in drosophila

Ploidy

No. of X chromosome

No. of Autosomal sets

Sex index (X/A)

Sex expression

2n

3

2

3/2

Meta female

3n

4

3

4/3

Triploid metafemale

4n

4

4

4/4

Tetraploid female

2n

2

2

2/2

Female

3n

3

3

3/3

Triploid female

4n

3

4

¾

Tetraploid intersex

2n

1

2

½

Male

4n

2

4

2/4

Tetraploid male

3n

1

3

1/3

Triploid meta male

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