True or pure breeding strains are typically used in generic studies. The term \"

Question

True or pure breeding strains are typically used in generic studies. The term "true or pure breeding" (or "pure breeding") strains means _. the strains have an unusually short generation time the strains always produces offspring with exactly the same features as the parent when allowed to self-fertilize the strains are homozygous for one allele for all traits the strains are heterozygous for one allele for all trains B and C in poodles, black coat color is dominant to white. A black poodle is bred with a white poodle. In four different litters, with 6-9 puppies in each, most of the puppies are black and some are white. Based upon this information, which of the following is the best conclusion? The parental black poodle is definitely homozygous. The parental black poodle is probably homozygous. The parental black poodle is definitely heterozygous. There is not enough information to make any of these conclusions. In the XX-XY sex determination system the _ is the heterogametic sex, and in the ZZ-ZW system the _ is the homogametic sex. male; male female; female male; male female; male Two independent loci (A, B) determine two unique aspects of the petals of flowers of a plant. Gene A determine if the flower petals have the dominant color red (A) or the recessive color cream. Gene B determines if the flower petals have dominant long petals or recessive short petals. In the parental cross, a true breeding plant #1 with red and long petals is crossed to a true breeding plant #2 with cream and short petals to generate F1 offspring. One if these F1 offspring is then crossed in a test cross. Which of the following represents the genotype of the F1 offspring of the parental cross? AABB aabb AaBb AAbb aaBB

Explanation / Answer

Ans 11. The term true or pure breeding basically stands for a strain of individuals which are homozygous for all the genes being considered. Hence, keeping that in mind, option E will be correct.

Ans.12. According to the given information the parental poodle is heterozygous since some of the puppies are white also. Heterozygote is an individual containing both dominant and recessive genes or may say traits or characters of a allelic pair while on the other hand homozygous individual have two similar genes for a particular character in a homologous pair of chromosomes. Hence option C is correct.

Ans.13. In the XX-XY sex determinant system the male is the heterogametic sex because males have two distinct sex chromosomes i.e., X and Y while in ZZ-ZW system males are homogametic sex. Hence, option A is correct.

Ans.14. Genotype of the F1 offspring will be AaBb.

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