You have repeated the Beadle and Tatum experiments using Neurospora to find muta

Question

You have repeated the Beadle and Tatum experiments using Neurospora to find mutants in the Arginine pathway (depicted below) and you isolate a new class of mutants. You suspect these mutants all have Gene B and they affect Enzyme B function. Which of the statements below would agree with your hypothesis? A) The mutant is unable to synthesize arginine when given precursor + citrulline B) The mutant is unable to synthesize arginine when given precursor + ornithine but is able to synthesize arginine when given precursor + citrulline c) The mutant is able to synthesize arginine when given precursor alone. D) The mutant is able to synthesize arginine when given percursor + ornithine. E) The mutant is unable to synthesize arginine when given precursor + citrulline but is able to synthesize arginine when given precursor + ornithine. What was Mendel able to infer from monohybrid crosses? A) Alternative versions of a gene account for differences in inherited characteristics. B) For each character, inherits two copies of a gene, one from each parent. C) A dominant allele determines an organism's appearance, while a recessive allele has no noticeable effect the organism's appearance D) The two allele in an organism for a heritable segregate during gamete formation. E) All of the above In a monohybrid cross for in mice for fur color black (B) versus white (b), the black allele is completely dominant over white. What is the expected phenotypic ratio of a single offspring from a male heterozygote and female heterozygote? A) 1:2:1 black:gray:white B) 1:1 black to white C) 1:3 black to white D) 3:1 black to white E) All offspring will be gray In a monohybrid cross for in mice fur color (B) versus white (b), the black allele is completely dominant over white. What the expected genotypic ratio of a single offspring form a male heterozygote and female heterozygote? A) 1:2:1; BB;Bb;bb B) 1:2:1; BB; Bb;bb c) 1:1, BB;bb D) 3:1, BB;bb E) All offspring are Bb If a parent is homozygous recessive for a particular trait, and the mother is heterozygous, what are the odds of having a child that displays the dominant trait? A) 0% B) 25% C) 50% D) 75% E) 100%

Explanation / Answer

Please find the answers below:

Part 7: Choice B (According to the image and the information, it can be seen that citruline is the last component which is required after the action of enzyme B. The enzyme B is defective in the system thus any precursor will not be able to synthesize arginine via this pathway. Thus, any precursor along with ornithine will be negative and any precursor with enzyme C and citruline will be positive for arginine biosynthesis)

Part 8: Choice E (All statements are correct regarding Mendelian pattern of inheritance and make the basis for the present advances in molecular biology and genetics. These experimental observations and declarations have been well tested and followed by researchers for many decades now)

Part 9: Choice A (This cross represents a classical example of Mendelian monohybrid self-cross between heterozygous parents which yields a phenotypic ratio of dominant : recessive as 3:1 as well)

Part 10: Choice A (This cross represents a classical example of Mendelian monohybrid self-cross between heterozygous parents which yields a phenotypic ratio of dominant : recessive as 3:1 as well and a genotypic ratio of BB:bB:bb ::1:2:1)

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