0 votes
306 views
in Biology Form 4 by

The following pedigree shows how the gene for colourblindness was passed in a family for three generations. The gene for colour blindness is sex linked.
BioF4et121p2q2

  1. Define the term sex linkage. 
  2. Write down the genotype of the parents A and B.
  3. Write down the phenotypic ratios of the 2nd generation from parents A and B. Show how you arrived at your answer. 

1 Answer

0 votes
by

  1. Phenomenon where genes controlling other traits are carried in the sex chromosomes with the sex gene and are transmitted together. 
  2.  
    • A- XcXc     
    • B- XcY
       
  3. Write down the phenotypic ratios of the 2nd generation from parents A and B. Show how you arrived at your answer. (5mks)
    BioF4et121p2qa2aa
    Genotype of 2nd generation
    Phenotypic ratio/Normal: 1 colourblind.

Related questions

0 votes
1 answer
asked Jul 15, 2021 in Biology Form 4 by daisyrono
0 votes
2 answers
0 votes
1 answer
asked Aug 13, 2021 in Biology Form 4 by garuambe
0 votes
5 answers
asked Sep 30, 2021 in Biology Form 4 by Nicah
Welcome to EasyElimu Questions and Answers, where you can ask questions and receive answers from other members of the community.

6.4k questions

9.6k answers

6 comments

590 users

...