Answer:
405 individuals will be yellow and round seeded.
Explanation:
<u>Available data:</u>
- the yellow seed trait is dominant over green seeds
- round seed trait is dominant over the wrinkled-seed trait
- These genes are on separate chromosomes
Let´s name the seed color genes Y, and the seed shape gene R
- Y is the dominant allele for seed color expressing yellow
- y is the recessive allele for seed color expressing green
- R is the dominant allele for seed shape expressing round
- r is the recessive allele for seed shape expressing wrinkled
Cross: between two plants that are heterozygous for both traits
Parental) Yy Rr x Yy Rr
Gametes) YR yR Yr yr YR yR Yr yr
Punnet Square) YR yR Yr yr
YR YYRR YyRR YYRr YyRr
yR YyRR yyRR YyRr yyRr
Yr YYRr YyRr YYrr Yyrr
yr YyRr yyRr Yyrr yyrr
F1) 720 individuals
9/16 yellow and round seeded individuals, Y-R-
3/16 green and round seeded individuals, yyR-
3/16 yellow and wrinkle seeded individuals, Y-rr
1/16 green and wrinkle seeded individuals, yyrr
<em>Note: the "-" symbol in the phenotypes means that there it could be either a dominant or recessive allele. </em>
If 720 is the total number of individuals in the F1, then:
16 possible genotypes ---------- 100% of the progeny -------- 720 individuals
9 yellow and rounded----------- 56.25% ----------------------------405 individuals
3 green and rounded-------------18.75%------------------------------135 individuals
3 yellow and wrinkled-------------18.75%------------------------------135 individuals
1 green and wrinkled--------------6.25%-------------------------------45 individuals
