Question

Fun-filled Genetics activity Set Psa plants were particularly well suited for use in Mendel's breeding experiments for all of the following m e thal Al was show easily terved various in a number of characters, such as a shape and flower color, it is powible to completely control tingshotween different pe plants, it is possible to a large numbers of progeny from any given cross. Dipeas have unusually long generation time, many of the observable characters that vary in pea plants are controlled by single genes. 2) The Foffspring of Mendel's classic poacross always looked like one of the two parental varieties because Alone allele was completely down over her B achele affected ple expo Cheras blended together during fentiration. D) se genes interacted to produce the parental phenotype. different genes interacted to produce the parental phenye 3) What was the most significant conclusion that Gregor Mendel drew fr is experiments with a plan A) There is considerable genetic variation in anden peas. B) Traits are inherited in descen d re the results of Wending ) Recessive penes o r more frequently in the then do dominant ones Genes are composed of DNA E) An organism that is homous for any recessive trais wa s te. 4) How many unique gameles could be produced through independent woment by an individual with the genotype ABCTMEE B C ) 16 D 32 E ) 645) A 9:33:1 phenotypic ratio is characteristic of which of the following? A) a monchybrid cross B) a dilybrid cross Chatriyadros D e gemes E) both A and D 6) A sexually reproducing animal has two unlinked genes, one for head shape and we fortail length(). Its nopes . Which of the following penotypes is possible in a gate from this organism? A) HIT C7 DT EN 7) It was important that Mendeleamined not just the Flori in his breeding experiment, but the generation as well because A) he obtained very few Fl progeny, making Matistical analysis difficult B) parental traits that were not observed in the F1 reappeared in the F2, suggesting that the traits did not truly disappear in the Fl. C) analysis of the Fl progeny would have allowed him to discover the law of segregation, but not the law of independ s the dominant phenotypes were visible in the F2 generation, but not in the Fl. E) all of the above 3) When crossing h o urs recessive with a h oyote, what is the chance of getting an offspring with the homopous recessive phenotype A)0% B) 254 C) 50% D) 75% E) 100 9) Black fur in mice() is dominant to brown furch Shettais cross B B B will have black fur and long tails? e dominant to long tails . What fraction of the progeny of the A) 1/16 B) 1/16 C) 3/8 D) 1/2 E) 9/16 10) In a cross Jabbe x alle, what is the probability of producing the genotype AABBCC? A) 1/4 B) 18 C) 1/16 D) 1/32 E) 1/64 11) Given the parents ABAC dhe assume simple dominance and independent assortiment. What proportion of the progeny will be expected to phenotypically resemble the first parent? A) 1/4 B) 1/8 D) 3/8 EI 12) A 2:1 phenotypic ratio in the F generation of a monohybrid cross is a sign of A) complete dominance B) lethal alleles. C) incomplete dominance. D) polygenic inheritance. E) pleiotropy. 13) In snapdragons, heterozygotes have pink flowers, whereas homozygotes have red or white flowers. When plants with red flowers 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%

Answer 1

1) The main reasons for selecting pea plant for experiments by Mendel were as follows: (a) It has many distinct alternative traits. (b) life span of pea plant is short. (c) Flowers show self pollination, so are true breeding. (d) It is easy to artificially cross-pollinate the pea flowers.(e) It has a short generation time. So option (D) is the correct answer.

2) The F1 offsprings obtained from classic pea cross always looked like one of the two parental varieties. Mendel selected the plant height trair which is controlled by two alleles, dominant allele (D) and recessive allele (t)The cross is as follows

Parents: TT (tall)    $\times$ tt (dwarf) gametes: T t    F1 generation: Tt (all tall plants) So from this experiment it is clearly observed that the F1 offsprings inherit the character of parental generation because the one allele is completely dominant over another. So option (A) is the correct answer.

3) The most significant conclusion that Gregor Mendel drew from his experiments with pea plants is that traits are inherited in discrete units and are not the result of blending. So option (B) is the correct answer.

4) The genotype of the individual is AaBbCCDdEE. Types of gametes= 2n, where n is the number of hybrid traits here n=3, number of unique gametes formed = 23 = 8. So the correct option is (B).