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Test Crosses & Dihybrid Crosses. Y=yellow, y=green, R=round, r=wrinkled According to the Law of Independent Assortment, a plant that is hybrid for 2 traits will form FOUR different gametes Y y R r Y R Y r y R y r. Independent assortment and Segregation. Possible gametes.
Dihybrid Crosses. When is it used?. A dihybrid cross is exploring the possibilities of TWO traits. For example, what will the offspring look like when a yellow, wrinkled pea plant is crossed with a green, smooth pea plant. You are looking at two traits- pea color and pea texture.
Dihybrid Crosses . A monohybrid cross involves only one trait. This is what we have been looking at so far. Ex. Only dimples, OR only tongue rolling ability. A dihybrid cross involves two traits. Also known as two-factor cross. Ex. dimples AND tongue rolling ability. .
Experimental crosses. Inbred Strain Cross. Backcross. F2 cross. Generation. F0. F1. F2. 1400. 1200. 1000. 800. Phenotype. 600. 400. 200. 0. 0.5. AA. AB. BB. Experimental crosses. Inbred strain crosses Recombinant inbreds Alternatives. F 0 Parental Generation.
Genetic Crosses. Section 9.2. Genotype. The genetic makeup of an organism Consists of the alleles that the organism inherits from its parents Example: white flowering pea plants (recessive trait pp ). Phenotype.
Dihybrid Crosses. **Crossing 2 different traits at the same time. 1. Determine dominant and recessive traits. Carefully read the problem!. 2. Assign letters for the trait. B = black b = white H = Hairy h = no hair. 3. Determine genotype for parents.
Dihybrid Crosses. Review of Monohybrid Crosses. Remember, monohybrid crosses involve only ONE trait Example: In fruit flies, red eyes are dominant over white eyes. In this example you are only examining the EYE COLOR trait. RR rr.
Dihybrid Crosses. The instructions or blueprints for making proteins are found in DNA. The information is carried in the sequence of the nitrogen bases . The sequences of DNA that help to create proteins are known as a genes.
Three Crosses. Three Crosses. Cross of Impenitence. Lawless: disrespect for the law of man and God. Hardness: Defied holy influence of Christ. Railed on him, “If you are the Christ, save yourself and us” (Lk. 23:39).