Help with grade 11 biology please!!(Chromosome Disorder & punnett square)

In humans, the recessive allele that causes a form of red-green color blindness (c) is found on the X chromosome.

-Determine the genotypes and phenotypes of the F1 generation from a color blind father and a mother who is homozygous for normal color vision.

-Determine the genotypes and phenotypes of the F1, generation from a father who has normal color vision and a mother who is heterozygous for color vision.

-Draw a Punnett square to determine the genotypes of parents that could produce a daughter who is color blind.


Can you also explain how you go the answer please..so i understand it a bit better ..THANK YOU!!
*** this is online so i cant ask a teacher

So since it is sex linked, it is on the X chromosome, for males they only have 1 copy of the X and one Y when a girl has 2x's, let's label XbY as the color blind male and XBXB as the normal female (B Is normal and b is color blind.) to set up the punnets square put the males on top and girls on the side and do the cross


Xb Y
XB XBXb XBY
XB XBXb XBY

All males are normal while the female are both heterozygotes for the color blind alles
Genotypes are 1/2 XBXb : 1/2 XBY (genotypes describe the GENES)
Phenotypes are 2 normal female : 2 normal males (how they look, or if they are color blind or not)

Normal father: XBY
Heterozygote mother: XBXb (she is a carrier)

XB. Y
XB XBXB XBY
Xb XBXb XbY

Genotypes: 1/4 XBXB : 1/4 XBY : 1/4 XBXb : 1/4 XbY
Phenotypes: 2 normal females : 1 normal guy : 1 color blind guy

Since the girl must be color blind, she must get 2 alleles for the ressessive color blind allele from BOTH parents cause she gets one gene from each, meaning the dad needs to be color blind and the mother needs to be heterozygotes

Genotypes of parnents: father is XbY and mother is XBXb

Xb. Y
XB. XBXb. XBY
Xb. XbXb. XbY

Notice one of the girls is XbXb meaning she has 2 copies of the bad color blind allele making her color blind

geno: 1/4 : XBXb : 1/4 XBY : 1/4 XbXb : 1/4 XbXb : 1/4 XbY
Pheno: 1 normal female : 1 normal guy : 1 color blind female : 1 color blind male

Hope this helps :)

im in 9th grade and i already did this im not going to tell you how bc ima dick

Momma MIa You yell out to your dad and say DAD AM I BOY OR AM I GIRL. end of story