1) Which of the following genetic crosses is used when neither allele is dominant? a) Monohybrid Cross b) Dihybrid Cross c) Incomplete Dominance d) Sex Linked 2) The term Heterozygous relates to 2 alleles which are different. E.g. a) BB b) Bb c) TT d) Tt 3) When an individual, heterozygous for 2 traits is crossed with another individual, also heterozygous for both traits, the ratio of the offspring will always be:   a) 2:1 b) 9:3:3:1 c) 9:3:3:0 d) 1:1:1:1 4) What does the 'locus' of a gene mean? a) Whether it is related to gender (sex linked) b) It's type - E.g. dominant or recessive c) It's position on a chromosome 5) If a blue eyed, straight haired man is involved in a genetic cross, what could his Genotype be? Brown eyes is dominant to blue eyes & straight hair is dominant to curly a) Blue & Straight b) bbSs c) BbSs d) bbSS e) BBss 6) What does F1 progeny mean? a) 1st generation of offspring b) 2nd generation of offspring c) 3rd generation of offspring 7) Round seed (R) is dominant to wrinkled seed (r) in plants and Yellow seed (Y) is dominant to green seed (y). What is the genotype of a plant heterozygous for both traits? a) RRYy b) RrYy c) rrYy d) RrYY e) Round & Green f) Round & Yellow 8) If a parent has the genotype BbSs, with brown eyes (B) dominant to blue eyes (b) and straight hair (S) dominant to curly hair (s), what are the possible gametes? a) BS, Bs, bS, bs b) BS, Bs, bS, bS c) BS, Bs, bs, Bs d) Bb, Ss 9) Which of the following demonstrates the meaning of the word 'Allele' in genetics? a) Parent Genotype: BBSs - Parent Phenotype: Brown & Straight b) Gametes: 1 comes from the mother, 1 from the father for each trait c) B for brown eyes, b for blue eyes 10) What term is used to describe the allele pair GG? a) Homozygous b) Heterozygous c) Incomplete Dominance d) Phenotype

6th Year Biology - Genetic Crosses

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