Multiple ChoiceA single gene test cross is conducted to determine the genotype of a pea plant that shows the dominant phenotype for height (T = tall, t = short). If all offspring of the cross show the dominant phenotype, then the genotype of the unknown parent is _______.a) TT.b) tT. c) Tt. d) tt.2180views6rank2comments
Multiple ChoiceYou want to determine the pea color genotype of a pea plant with yellow peas. You conduct a test cross with your mystery pea plant. The test cross results in 50% of the offspring possessing yellow peas and 50% of the offspring possessing green peas. What is the genotype for pea color of the mystery parent?a) YY.b) Yy.c) yy.d) None of the above.1586views13rank
Multiple ChoiceWhat is indicated when a single-character testcross yields offspring that all have the dominant phenotype? 754views
Multiple ChoiceA gray-bodied, vestigial-winged fly is crossed with a black-bodied, normal-winged fly. The F1 progeny is testcrossed. Among the resulting offspring, __________ is a parental type, and __________ is a recombinant type. 950views1rank
Multiple ChoiceTo identify the genotype of a yellow-seeded pea plant as either homozygous dominant (YY) or heterozygous (Yy), you could do a test cross between your mystery plant and a plant with a genotype of _______. 432views3rank
Textbook QuestionIn flies, small wings are recessive to normal wings. If a cross between two flies produces 8 small-wing offspring and 28 normal-wing offspring, what are the most likely genotypes of the parents? (Use S to represent the normal-wing allele and s to represent the short-wing allele.)586views
Textbook QuestionIn flies, small wings are recessive to normal wings. If a cross between two flies produces 8 small-wing offspring and 28 normal-wing offspring, what are the most likely genotypes of the parents? (Use S to represent the normal-wing allele and s to represent the short-wing allele.)375views
Textbook QuestionIn 1981, a stray black cat with unusual rounded, curled-back ears was adopted by a family in Lakewood, California. Suppose you owned the first curl cat and wanted to breed it to develop a true-breeding variety. Describe tests that would determine whether the curl gene is dominant or recessive and whether it is autosomal or sex-linked. Explain why you think your tests would be conclusive. Describe a test to determine that a cat is true-breeding.600views
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