Question

Bio215 Problem Questions Hassanaton MULTIPLE CHOICE 1) Pea plants were particularly well suited for use in Mendel's breeding experiments for all of the following reasons exep that ) peas show easily observed variations in a number of characters, such as pea shape and flower color. B) it is possible to completely control matings between different per plants. C) it is possible to obtain large numbers of progeny from any given cross. D) peas have an unusually long generation time. E) many of the observable characters that vary in pea plants are controlled by single genes. 2) The F. offspring of Mendel's classic peacross always looked like one of the two parental varieties because A) one allele was completely dominant over another. B) each allele affected phenotypic expression. C) the traits blended together during fertilization. D) no gentes interacted to produce the parental phenotype. E) different genes interacted to produce the parental phenotype 3) What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants? A) There is considerable genetic variation in garden peas. B) Traits are inherited in discrete units and are not the results of "blending." C) Recessive genes occur more frequently in the than do dominant ones. D) Genes are composed of DNA. E) An organism that is homozygous for many recessive traits is at a disadvantage. 4) How many unique gametes could be produced through independent assortment by an individual with the genotype BCCAREZ A) 4 B) C) 16 D) 32 E) 64 5) A 9:3:3:1 phenotypic ratio is characteristic of which of the following? A) a monohybrid cross B) dhybrid Cross C) a trhybrid cross D) linked genes E) both A and D 6) A sexually reproducing animal has two unlinked genes, one for head shape (II) and one for tail length (I). Its genotype is th77. Which of the following genotypes is possible in a gamete from this organism? A) HTB) Nh C) INTI D) TE) 7) It was important that Mendel examined not just the Fl generation in his breeding experiments, but the F2 generation as well. because A) he obtained very few Fl progeny, making statistical analysis difficult. B) parental traits that were not observed in the FI reappeared in the F2, suggesting that the traits did not truly disappear in the FI. C) analysis of the Fl progeny would have allowed hin to discover the law of segregation, but not the law of independent assortment. D) the dominant phenotypes were visible in the F2 generation, but not in the FI. E) all of the above 8) When crossing a homozygous recessive with a heterozygote, what is the chance of getting an offspring with the homozygous recessive phenotype? A)0% B) 25% C) 50% D) 75% E) 100% 9) Black fur in mice (1) is dominant to brown fur (). Short tails (7) are dominant to long tails . What fraction of the progeny of the cross BbT* BBt will have black fur and long tails? A) 1/16 B) 3/16 C) 3/8 D) 1/2 E) 9/16 10) In a cross AaBex AaBbc, what is the probability of producing the genotype AABBCC? A) 1/4 B) 1/8 C) 1/16 D) 1/32 E) 1/64 m) Given the parents ABAC Aabe assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent? A) 1/4B) 1/8 C) 3/4 D) 3/8E) 1 12) A 2:1 phenotypie ratio the generation of a monohybrid cross is a sign of A) complete dominance. B) lethal alleles. C) incomplete dominance. D) polyge inheritance. E) pleiotropy. 13) In snapdragons, heterozygotes have pink flowers, whereas homozygotes have red or white flowers. When plants with red flow are crossed with plants with white flowers, what proportion of the offspring will have pink flowers? A)0%B) 25% C) 50% D) 75 E) 100% 17) Show the work for a dihybrid cross. bll-yellow fur, large-ear rats and BBLL-brown-fur, small-ear rats

Answer 1

1) except- D- pea plants have an unusually long generation time

2) A- one allele was completely dominant over another

3) B- traits are inherited in discrete units and are not the results of "blending"

4) 2^3(no. of heterozygous)= 8 (B)

5) B- dihybrid cross

6) A- HT