Question

IS ILLUSSIVE in females. Lay the palm of your hand a sheet of paper and line the tip of your ring finger with the edge of the paper. A short index finger will not be longer than the page, but a long index finger will extend beyond the page. enetics problems ou should be able to complete all these types of crosses (using Punnett's squares) for the exam. 1) In corn, the high sugar content (s) is recessive to the allele for starchy (S). Give the phenotypes for the following individuals: SS, Ss, ss 2) In rabbits, short hair (H) is dominant to long hair (h). If a homozygous shorthaired female is mated to a long haired male, what are the phenotypes and genotypes of the Fl generation? 3) If the first generation (FI) were mated with the male parent (a backcross in genetics), what are the phenotypes and genotypes of the F2 generation? If mated to the female parent? 4) In humans, the trait for six fingers (F) is dominant to five fingers (t). A male (Jack) and a female (Jill) both carry the characteristic for six fingers, but the fathers for both these individuals (i.e, the grandparents) only had five fingers. What are the phenotypes of the male and female parents of Jack and Jill? What are their genotypes? 5) Suppose these individuals (14) planned on having a child. What is the probability that the child will have six fingers? What is the probability they will have five fingers? Is this characteristic sex linked?

Answer 1

Answer: - Dominant allele - According to the lace of dominance, out of the two contrasting wuleles, only one expresses itself. The allele that expre- sses is called the dominant cobile the other, cohich fails to express itself, is called Recessive allele. When true breeding Chomozygous) dominant & recessive plants are crossed it is the domi- nont trait cohich expressed in F1. The recessive character reappears in the second generation. 8.1] Answer:- In corn, Starchy (S) is dominant ('s') high sugar content. trait over the then SS = starchy corn 7 Ss - Starchy corn SS - High Sugar content) corn Phenotypes. 9. 2] Answer:- In Rabbits, H = short bour & domipoot h = long hair recessive If Homozygous shorten female (HH) maled with long haired male Chh),

HH. (short hair) hh and (long hair) a Concert HH hb h h HhHh HhHh H All Fj Progeny Shows Genotype “Hh F1 Genotype : Hh. Fl phenotype : Shorten hairs.

8:37 Answer: - - IF coe made & backcrosse - Fis mated with male parent, P: x Hh (Short hair) bb (long hair) ni ox НЬ bh Genotypes HHO THE hhh I hh F2 2. Hh 2: hb F2 Genotypes ce Phenotypes Hh hb - - short hairs long hairs If Ez mated with female parents X Hh - (Short hain HH ( short hair) HH Hh

H H HHHHH F2 Cenolypes: 2: HH 2: 1h Hb Hb F2 Cenotypes HH Hh Phenotypes short hair Short hair Q.4] Answer - In bumon, Trait (E) six finger = dominant Iait (fj five finges - recessive As both Jack & Jill Corry a characteristic Of six fingers, means both of them must have to carry atleast one dominant (E) it shows six fingers. Both these individuals fether only had five fingers, means they hand genotypeats (FE), as it shows five fingers. As their duether's carry homozygouy CEF) genes Jack & Jill also must have single 'f' gene cobich inherited into them from Father.. - bo the Crenotype of Jack & Jill must have consists one dominant & one recessive gene from athyen above conditions. Jack's Crenotype = Ff Jill's Genotype = Ff

As their feether's do not possesses domi- -nant F gene required for characteristic of Sjx fingers, means the gene (dominant F) is inherited into them from their mother. bo, Jemwe parents of Jack = EF/EF Fernale parent of Jill = FF/ Ff for pedigree, convinience, we will draw - FF FF FF/FF L Iff I ff Jack Ff 8.5] Answerin bupposed they planned to having a child, Ef EF Jack Ff FA

FE FF Ef ff Genotype Phenotypes 1 : FF -> Six fingers 2:FF » Six fingers 1 : ff - Five Fingers. Means, cohere 75% chances child have are six there, fingeros & 25.1 child with chances five to have fingers. It is not sex - linked trait. As it is inhe- sited in a simple Mendelian pattern. That is they can be either dominant or recessive trait. It is a cutosomal trait.