Question

Directions: For each of the following problems 13-18, 1. List the genotypes of the parents. 2. Diagram and complete a Puonett square 3. Give the phenotype percentages of the offspring. In garden peas, round seed coats (R) is dominant over wrinkled seed coats (r). 14.) What will the results be of a cross between a homozygous dominant male and a recessive female? In peas, yellow color (Y) is dominant to green (y). 15.) What will be the results of a cross-pollination of a heterozygous female and a heterozygous male? In humans, straight toes (S) are dominant over curled toes (s). 16.) What would be the result of a cross between a recessive male and a heterozygous female? In dogs, big ears (E) are dominant small ears (e). 17.) What are the results if two heterozygous dogs have a litter of puppies? The ability to roll the tongue (R) is determined by a dominant gene while the recessive gene results in the inability to roll the tongue (r). A man and his wife can both roll their tongues and are surprised to find that their son cannot. 18.) Explain this by showing the genotypes of all three persons. (Note: You do not need to do a Punnett Square for this problem).

Answer 1

кекке ALLAANNAAALLE GARDEN PEAS - SEED COATS. :) round seed coat is dominate . let's denote is a 'R' 1) wrinkled sed coat is recessive let's Go - denote i t as ar - Homozygous reussue female - rr X - X Homozygous dominant mal RR PARENTS GAMETES GAMETES (W) Ď 0 ® ® I FI GENERATION o gamites. ļ - gametis r & R I Rr Rr | I R Rr Rr HAS ROUND PHENOTYPE - - 2007. SEED OFFSPRING COAT.

ΑΑΑΑΑΑΑΑΑΑ ? is dominant. Let's denote PEAS - COLOR ;) Yellow color ist as y ii) green color it as y. is recessive Let's denote X HETEROZYGOUS " FEMALE PARENTS HETEROZYGOUS MALE GAMETES GAMETES & 020 " 8 gametes FERTILIZATION yy yy. gametis ① Yy / y y FI GENERATION - PHENOTYPE OF OFFSPRING - 75 1. PEAS ARE YELLOW IN COLOR 251. PEAS ARE GREEN IN COLOR . ARAAN Scanned with CamScanner

LET'S HUMANS - TOES ;) STRAIGHT TOES - DENOTE IT AS WRLED TOES DENOTE IT AS ARE DOMINANT. s ARE RECESSIVE. s LET'S X HETEROZYGOUS FEMALE SS RECESSIVE MALE SS PARENTS GANTE TES ☺ GAMETES ☺ ☺ ☺ FERTILIZATION o gametis e ③ ss ss 1 gametis ss I ss I FI GENERATION - PHENOTYPE OF OFFSPRING 50-1. OFFSPRING HAS STRAIGHT TOES a 50-1. OFFSPRING UAS WRLED TOES

AN DOMINANT, LET'S DENOTE DOGS - EARS "BIG EARS ARE IT AS E i) SMALL EARS DENOTE IT AS ARE e RECESSIVE. LET'S NAAAAA - X HETEROZYGOUS FEMALE HETEROZYGOUS MALE PARENTS Ee CAMETES © C FERTILIZATION ес gamites @ Ee Lee F GENERATION - PHENOTYPE 757. OFFSPRING HAS BIG 251. OFFSPRING HAS SMALL OF OFFSPRING EARS CARS AA Scanned with GamScanner

I ability to roll tongue i a dominant gene. Let's d determined by denote it as i) inability to rolu tongue is determined by a recessive gine. Let's denote it مه . AS BOTH PARENTS CAN ROLL TONGUE WHEREAS THEIR SON CANNOT THE ONLY CONDITION WHERE THIS IS POSSIBLE IS THAT BOTH THE PARENTS ARE HETEROZYGOUS FOR THIS GENE. GENOTYPE of FATHER 4GNO TYPE OF MOTUCR GENOTYPE OF SON Rr γY AAA Scanned with CamScanner