University:
Fresno Pacific University
Course:
BIOL 450 | Genetics
Academic year:

2020
Views:

375

Pages:

2
Author:

lankstoetp9

Inheritance Patterns Worksheet #1 Complete Dominance: Monohybrid Crosses YOU MUST USE PUNNETT SQUARES TO SHOW YOUR WORK A homozygous tall plant (TT) is crossed with a homozygous short plant (tt). What are the genotypes and phenotypes of the offspring? What is the phenotypic ratio? Genotypic Ratio: 100% Tt Phenotypic Ratio: 100% tall A homozygous red-flowered plant (RR) is crossed with a homozygous white-flowered plant (rr). What are the genotypes and phenotypes of the offspring? What is the phenotypic ratio? Genotypic Ratio: 100% Rr Phenotypic Ratio: 100% red flower A man with a widow's peak (WW) and his wife who has a straight hairline (ww) are expecting a child. What is the probability that the child will have a widow's peak? What are the possible genotypes of the offspring? Genotypic Ratio: 100% Ww Phenotypic Ratio: 100% widow's peak In people, brown eyes (B) is dominant over blue eyes (b). A marriage between two blue-eyed people produces only blue-eyed children. Is this possible? Yes, both parents would have the genotype bb. A dog with black fur (BB) is crossed with another dog with black fur. How often could they have black fur? Genotypic Ratio: 100% BB, Bb Phenotypic Ratio: 100% black fur Complete Dihybrid Cross A man with genotype BbRr, that has brown eyes and red hair, marries a woman with the genotype bbRr, who has blue eyes and red hair. What are the different possible genotypes and phenotypes of their offspring? Mother's Gametes: BR, Br, bR, br Father's Gametes: bR, br | | BR | Br | bR | br | |---|---|---|---|---| | bR | BBRR | BBRr | BbRR | BbRr | | br | BBrR | BBr | BbRr | Bbrr | Offspring's Genotype: BBRR, BBRr, BbRR, BbRr, BBrR, BBr, BbRr, Bbrr Offspring's Phenotype: Brown eyes, red hair; Brown eyes, red hair; Brown eyes, red hair; Brown eyes, red hair; Brown eyes, red hair; Brown eyes, red hair; Brown eyes, red hair; Brown eyes, blonde hair A man with the genotype GgBb, that has green eyes and brown hair, marries a woman with the genotype ggbb, that has blue eyes and blonde hair. Diagram the Punnett square for the offspring's genotypes and phenotypes. Mother's Gametes: gb, gb Father's Gametes: GB, Gb, gB, gb | | GB | Gb | gB | gb | |---|---|---|---|---| | gb | GgBb | Ggbb | ggBb | ggbb | | gb | GgBb | Ggbb | ggBb | ggbb | Man's possible combinations in his gametes: GB, Gb, gB, gb Woman's only combination in her gametes: gb, gb Offspring's genotypes: GgBb, Ggbb, ggBb, ggbb Offspring's phenotypes: Green eyes, brown hair; Green eyes, blonde hair; Blue eyes, brown hair; Blue eyes, blonde hair

Monohybrid Cross Worksheet Answers

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