Gene Interaction Flashcards

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1
Q

What is gene interaction

A

When more than one nonallelic gene influence outcome of single trait

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2
Q

Type of gene interaction

A

Epistasis- gene(epistasis) mask expression of other gene(hypostasis)
Interaction between allele of different locus
-non allelic interaction (vvv imp)

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3
Q

Dominance vs epistasis

A

Dominanace- interaction between diff alleles of same gene
Epistasis- interaction between different genes

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4
Q

Types of epistasis with ration and example

A

Original 9:3:3:1

Duplicate recessive -9:7
aa epistatic to B/b
bb epistatic to A/a
Mutation on one gene
Eg lathyrus odoratus(flower colour of sweet pea)- 🟣 🀍
Both A and B req for anthocyanin production

Duplicate dominant - 15:1
A epistatic to B/b
B epistatic to A/a
Wheat kernel colour

Dominant and recessive- 13:3
B epistatic to A/a
When dominant allele of one gene supress dominant allele of second gene
PRIMULA PLANT- MALVIDIN πŸ”΅ plant
B supress production of malvidin so 🀍

Recessive- 9:3:4
aa epistatic to B/b
Recessive allele at one gene mask/reduce other gene
AGOUTI COAT COLOUR- black and albino
A black
B AGOUTI
bb black
aa- albino (doesn’t depend on b/B)

Dominant-12:3:1
A epistatic to b/B
Dominant allele mask expression of of allele of second gene
A- a express
If aa, B/b express
SQUASH COLOUR- 🀍 πŸ’› πŸ’š
A white
b green
B yellow

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5
Q

Complement analysis

A

K/as cis trans test.
Determine whether 2 independently isolated mutants with the same phenotype have mutation in same/different genes

Cross mutant strain
If mutation in different gene- progeny wild (complement each other)
If mutation in same gene at diff location- mutant

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6
Q

Pleiotropy

A

Effect of one gene on more than one phenotype
White eyes in drosophila also effects shape of organs in female and sperm storage
Frizzle trait in chicken- defective fether and metabolism rate nd temp sensitivity etc
Sickle cell anemia

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7
Q

Polygenic trait

A

Many genes controlling single trait

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