Ciruhano

PUNNETTE SQUARES PROBLEMS TO SOLVE FOR THE PROJECT.



Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of an offspring with the same phenotype as its parents in across between a homozygous black and a heterozygous black guinea pig

1.  In garden peas, round seed coats (R) is dominant over wrinkled seed coats (r).  What will the results be of a cross betweena homozygous dominant male and a recessive female. 
2.  In peas, yellow color (Y) is dominant to green (y). What will be the results of a cross-pollination of aheterozygous female and a heterozygousmale?
3.  In humans, straight toes (S) is dominant over curled toes (s).  What would be the result of a cross between a recessive male and a heterozygous female?
4.  In dogs, erect ears (E) isdominate over droopy ears (e). What are the results if two heterozygous dogshave a litter of puppies.
5.  The ability to roll the tongue (R) is determined by a dominant gene while the recessive generesults 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.  Explain this by showing the genotypes of all threepersons.  (Note:  you do not need to do a Punnett Square for this problem).
6.  In humans, wavy hair (CS) results by the co-dominant situation of curly hair (C) and straight hair (S).  What are the possibleresults if a curly-haired man and wavy-haired woman have children.  
7.  In iris, purple (p) is incompletely dominant over white (w). What would be the results of a cross if both parents were palelavender (heterozygous-pw)?
8.  In crocus flowers, white (W) and purple (P) colors are co-dominant, and result in a purple and white striped flower when both genes are present.  What are the possibleresults from the cross-pollination of astriped crocus with a white crocus?
9.  In cattle, red (r) is incompletely dominant over white (w) hides.  Roan in the name of the color that results from...