10. A man has either an AaBB or AABb genotype with equal probability. Assume the

Question

10. A man has either an AaBB or AABb genotype with equal probability. Assume these genes assort independently. What is the overall probability that the man will produce an Ab gamete? 11. In Mendel's peas, purple flower color is dominant to white. From which of the following descriptions can you NOT infer the genotype completely? A) purple B) white C) pure-breeding purple D) pure-breeding white E) heterozygous If an organism of genotype Aa was used for a testcross, what was the genotype of the other individual used in the cross? A) AA B) Aa C) aa D) Either Aa or aa E) Either AA or Aa 12. 13. Which of the following statements is TRUE? A) C) D) The genotype is the physical appearance of a trait. Alleles, genes, and loci are different names for the same thing. The phenotype of a dominant allele is never seen in the Fi progeny of a monohybrid cross A testcross can be used to determine whether an individual is homozygous or heterozygous for a dominant allele. 14. In poodles, black fur is dominant to white fur. A black poodle is crossed with a white poodle. In a litter of four, all of the puppies are black. What is the BEST conclusion? A) The black poodle is definitely homozygous B) The black poodle is probably homozygous. C) The black poodle is definitely heterozygous. D) The black poodle is probably heterozygous. E) The genotype of the black poodle cannot be inferred with this information.

Explanation / Answer

10) The genotype of the man has an equal probability of having either AaBB or AABb. The overall probability that the man will produced Ab gamete is,

= 1/2 × 1/2

= 1/4

= 0.25

11) The dominant trait is expressed in both homozygous and heterozygous conditions. The purple color is expressed both in homozygous and heterozygous genotypes. So, we cannot clearly identify the genotype if only purple color is known (option A).

12) In test cross, the induvidual with unknown genotype is crossed with homozygous recessive individual (option c).

13) Phenotype is the physical appearance of the trait. The phenotype of dominant allele is expressed in F1 generation. Called, genes and loci are not synonymous.

Test cross is used to identify the genotype of the unknown individual. Therefore, the answer for this question is option D.

14) The F1 offsprings between poodles with black and white fur are all black. This shows that black poodle is definitely homozygous (option A).

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