[Incomplete question. I found these
data in other source]
Brown: BB and Bb
White: bb
Narrow: LL and Ll
Long: ll
Answer:
This means that long is recessive and narrow is dominant, and also brown is
dominant and white is recessive.
root color -> Alleles: narrow (L) and long(l)
leaflets length -> Alleles: brown (B) and white (b)
a) A brown (homozygous)
narrow (heterozygous) mandioca is BBLl, so it can produce BL or Bl gametes
A white mandioca is
always homocygous, so a white narrow (heterozygous) mandioca is bbLl - this
means it can produce bL and bl gametes.
So
here is the Punnett square:
---|-- BL-|--Bl--
bL|BbLL| BbLl
-bl|BbLl-|Bbll
So 75% of the offspring will
be brown and narrow and 25% will be brown and long.
b) A long mandioca is always homocygous, so a brown (homocygous) long mandioca
is BBll – this means it can only produce Bl gametes.
As white has to be homobygous as well, a white
long mandioca has to be bbll – this means it can only produce bl gametes.
So
here is the Punnett square:
---|- Bl
bl-|Bbll
So all the offspring is going to be brown and
long.
