Male maker x female banana?

[EmiLee]

What normally happens if you breed a male maker banana to a female banana? Does the banana offspring still come out as males or does it normalize the ratio because of the genetics from the female?

[dr del]

The female will throw a normal sex ratio but ,iirc, any males produced will be female makers.

[paulh]

Short answer:
The result is expected to be banana females, normal females, super banana males and male maker banana males in approximately equal numbers. Rarely a super banana female, normal male or female maker banana male shows up.


Long answer:
X^b = banana gene on X choromosome
X⁺ = normal gene on X choromosome
Y^b = banana gene on Y choromosome
Y⁺ = normal gene on Y choromosome


X^b/X^b = super banana female
X^b/X⁺ = banana female
X⁺/X⁺ = normal female

X^b/Y^b = super banana male
X^b/Y⁺ = banana male (female maker)
X⁺/Y^b = banana male (male maker)
X⁺/Y⁺ = normal male

Most of the time, a banana male (male maker) (X⁺/Y^b) x banana female (X^b/X⁺) produces
1/4 X^b/X⁺ = banana female
1/4 X⁺/X⁺ = normal female
1/4 X^b/Y^b = super banana male
1/4 X⁺/Y^b = banana male (male maker)
In the above list, the egg's chromosome is first, and the sperm's chromosome is second.

Less than 10 percent of the sperm and eggs have a crossover. In sperm, the banana gene on the Y chromosome has switched to the X chromosome, and the normal gene on the X chromosome has switched to the Y chromosome. In eggs, there is no difference between crossovers and non-crossovers.

Results from crossovers:
1/4 X^b/X^b = super banana female
1/4 X⁺/X^b = banana female
1/4 X^b/Y⁺ = banana male (female maker)
1/4 X⁺/Y⁺ = normal male
In the above list, the egg's chromosome is first, and the sperm's chromosome is second.