Bra cup size genes?

1. where do girls usually get their bra cup size genes from? like their mother, grandma, etc?
Answer:
Bra size is determined like other features - hair color and texture, eye color, skin color. That is to say, there isn't one or two dominant genes that are passed down and determine bra size.

For example, of me, my mother, my two sisters, and my niece, you have:
34A, 34B*, 40C*, 36DD, 38DDD*

The ones with stars are my sisters and I. All have the same parents.

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When I was back in high school, the advice for boys was if you want to know what shape your girlfried would turn out to be, look at her mother.

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