University:
Eastern Kentucky University
Course:
BIO 315 | Genetics
Academic year:

2021
Views:

416

Pages:

3
Author:

ilikemyicons0y5

Punnett square worksheet Complete the following monohybrid crosses: draw a Punnett square, list the ratio and describe the offspring. Be sure to remember that the capital letter is dominant. Example) A green pea plant (GG) is being crossed with a green pea plant (Gg). G G GenoType= 2 GG: 2 Gg ; 0 gg G GG GG Gg Gg g Phenotype= 4 Green pea plants: 0 other color 1) A green pea plant (Gg) is crossed with a yellow pea plant (gg). G 2 GG, 2Gg, 2gg g 4 green g g Gg gg Gg gg 2) A tall plant (TT) is crossed with a tall plant (Tt). T 2TT, 2Tt, 0tt 4 tall T t T TT TT Tt Tt T t 3) A tall plant (Tt) is crossed with a short plant (tt). t Tt tt t Tt tt 0TT, 2Tt, 2tt 2 tall, 2 short R 4) A red flower (Rr) is crossed with a white flower (rr). r 0RR, 2Rr,2rr 2 red, 2 white r r Rr rr Rr rr r 5) A white flower (rr) is crossed with a white flower (rr). r 0RR,0Rr,4rr 4White r r rr rr rr rr 6) A black chicken (BB) is crossed with a black chicken (BB). 4BB,0Bb,0bb B 4 Black B B B BB BB BB BB Punnett square problems continued Complete the following problems. List the parent genotypes, draw and fill in a Punnett square, and then list the offspring genotypes and phenotypes. 1. A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). B B 2BB,2Bb,0bb 4 Brown B BB BB b Bb Bb 2. Two heterozygous white (brown fur is recessive) rabbits are crossed. W w 1WW,2Ww,1ww 3 White and 1 Brown W w 3. WW Ww Ww ww Two heterozygous red flowers (white flowers are recessive) are crossed. R r 1RR,2Rr,1rr 3 Red and 1 White R r 4. RR Rr Rr rr A homozygous tall plant is crossed with a heterozygous tall plant (short is the recessive size). T T 2TT,2Tt,0tt 4 Tall T t TT TT Tt Tt 5. A heterozygous white rabbit is crossed with a homozygous black rabbit. B B b b Bb bb Bb bb 0BB,2Bb,2bb 2 White and 2 Black