In summer squash, white fruit color(W) is dominant over yellow fruit color(w). If a squash plant homozgous for white is crossed with a plant homozygous for yellow, what will the genotypic ratio be for F2 generation? A)1:1 B)3:1 C)1:1:1:1 D)1:2:1

In a series of crosses involving pea plants that have round or wrinkled seeds (round is dominant to wrinkled) and yellow or green seeds (yellow is dominant to green), the following ratios were observed in the progeny: Parents -----> Progeny a) round, green x wrinkled, yellow -> 100% round, yellow b) round, yellow x round, yellow ---> 9/16 round, yellow 3/16 round, green 3/16 wrinkled, yellow 1/16 wrinkled, green c) round, yellow x round, yellow ----> 3/4 round, yellow 1/4 wrinkled, yellow d) wrinkled, yellow x round, yellow -----> 6/16 wrinkled, yellow 2/16 wrinkled, green 6/16 round, yellow 2/16 round, green On the basis of these progeny ratios, determine a possible genotype for each of the parent plants in each set of crosses (a,b, c, and d). Sometimes more than one genotype is possible, but you need only suggest one.

A purpled-flower plant (WW) is crossed with a white-flowered plant (ww). The F1 generation offspring are crossed with each other (selfing). Which of the following is the correct genotype of the F2 generation? A)WW, Ww, Ww, ww B)ww, ww, WW, WW C)Ww, Ww, Ww, Ww D)WW, WW, ww, Ww

a) 1/3 b)1/2 c)1/8

Consider sweet peas where aabb genotypic class produces purple flowers and all other genoitypic classes have white flowers. A)- If the parental generation is AA bb * aa BB what phenotypic ration do you expect in the F2 generation assuming complete penetrance ? B)- suppose now that only 75% of aabb individuals have purple flowers (that is, the penetrance of this trait is 75%. what phenotypic ratio do you now expect among the F2 plants? Also, in doing these types of crosses, what other phenomena (other than incomplete dominance) could explain the phenotypic ratio answered in part b.

Dr. Thompson learned in her university genetics course to memorize probability outcomes from monohybrid crossing scenarios so there is never a need for drawing Punnett squares or forked line diagrams. Which equation would Dr. Thompson use to predict the probability of obtaining a tester outcome from the cross of MmNn X Mmnn?     a) ¼ mm X ½ nn.   b) ½ mm X ½ nn.   c) ½ Mm X ½ nn.   d) ½ Mm X ¼ nn.

A white-flowered plant is crossed with a red-flowered plant and all of the offspring are pink. This is an example of: A) sex-linked inheritance B) the principle of segregation C) incomplete dominance D) linked genes E) codominance

Sickle cell anemia is a recessive trait in humans. In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the sickle cell allele, what is the probability that both of their first two children will be affected? A) none B) 1/16 C) 1/8 D) ¼ E) ½

A particular flower can be purple, blue, red or white. Two different pure-breeding white plants are crossed and the F1 are then crossed to produce an F2 generation. What might a 9:7 phenotypic ratio in the F2 indicate? A) additivity B) codominance C) recessive lethality D) reciprocal recessive epistasis E) dominant epistasis Explain each answer.

A heterozygous inidividual with blood type A marries a heterozygous individual with blood type B. What blood types could their offspring exhibit? A)all of these are possibleB)ABC)AD)OE)B