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GENETICS WORKSHEET #2 COMPLETE
DOMINANCE NOVAK
PAPWs2GeneticsCompDom3-11.doc
INSTRUCTIONS: fill in the blanks with your answer and SHOW YOUR
WORK in the Punnett squares provided at the right of the problem then fill in
the blank.
Problem 1. In some of Mendel's later crosses, he found that the gene
for purple flowers was dominant over the gene for white flowers. If you
crossed a plant that was pure for purple flowers with a plant that was
pure for white flowers, what results would you expect out of four. How
many would be: purely dominant 1__________ hybrid 2__________
purely recessive 3__________ purple 4__________ white
5__________
Problem 2. If you crossed one of the hybrids from the first generation
obtained in problem with a plant with white flowers, what results would
you expect out of 4. How many would be: purely dominant
6__________ hybrid 7__________ purely recessive 8__________
purple 9__________ white 10__________
Problem 3. In summer squash, white colored fruit is dominant over
yellow. If you place the pollen (the male sex cell) from a homozygous
white-fruited plant on the pistil (the female sex cell) of a heterozygous
white-fruited plant, what types of plants would you expect out of four.
How many would be: purely dominant 11__________ hybrid
12__________ purely recessive 13__________ white 14__________
yellow 15__________
Problem 4. Mid-digital hair is a common condition on the back of the
fingers between the middle knuckle and the knuckle nearest the wrist.
The gene for mid-digital hair is dominant while the gene for non digital
hair is recessive. A man who is homozygous dominant for mid-digital
hair marries a women who is heterozygous. What results would you
expect if they had four children? How many would be: purely dominant
16__________ hybrid 17__________ purely recessive 18__________
mid-digital hair 19__________ no digital hair 20__________
Problem 5. What results would you expect in the four children, if the
women in problem 4 had the homozygous recessive genotype? How
many would be purely dominant 21__________ hybrid 22__________
purely recessive 23__________ mid-digital hair 24__________ no
digital hair 25__________ What would the woman's phenotype be in
this problem? 26__________
Problem 6. In humans, the gene for normal skin color is dominant
over the gene for albinism which causes a total lack of body color. An
albino man marries a normally pigmented woman who had an albino
mother. If they had four children, what would you expect? How many
would be: purely dominant 27__________ hybrid 28__________ purely
recessive 29__________ normal skin 30__________ albino
__________
Problem 7. A widow's peak is characterized by a downward point of
hair in the center of the forehead. The gene for this is dominant over
the gene for a straight hairline. A man and his wife have a widow's
peak and have one child WITHOUT a widow's peak. If this couple were
to have four more children, what should the results be? How many
would be: purely dominant 32__________ hybrid 33__________ purely
recessive 34__________ widow's peak 35__________ straight hairline
36__________
Problem 8. NATURAL right-handedness is dominant over natural lefthandedness. A woman who is right-handed has two children who are
left-handed by her first husband. By her second husband, she has one
right-handed and one left-handed child. Answer the following blanks
with a YES or NO. Is it POSSIBLE for the woman's SECOND husband
to be: purely dominant 37__________ hybrid 38__________ purely
recessive 39__________ right-handedness 40__________ lefthandedness 41__________