Download Lab #4: Quiz

Lab #4: Quiz
1. From which of the following crosses could offspring be produced that have a genotype
different from either parent?
Cross 1:
Cross 2:
Cross 3:
Cross 4:
aa x aa
AA x aa
Aa x aa
Aa x Aa
2. For exercise #2, present the results of an experiment that identified a cat with the DD
genotype and the results of an experiment that identified a cat with the Dd genotype.
3. The gametes produced by parent #1 all carried the F allele. The gametes produced by
parent #2 carried either the F allele or the f allele. What is the genotype of each parent?
4. Consider the cross of two heterozygous parents: Dd x Dd
i) What is the chance that the right parent will produce a gamete carrying the D allele?
ii) What is the chance that the left parent will produce a gamete carrying the d allele?
iii) What is the chance of an offspring of genotype dd?
iv) What is the chance of an offspring of genotype DD?
v) What is the chance of an offspring of genotype Dd?
5. Flower color in pea plants is controlled by a single gene with two alleles, designated
“P” and “p”. The “P” allele is dominant and determines the purple flower color
phenotype and the “p” allele is recessive and determines the white flower color
phenotype. Seed shape is controlled by a single gene with two alleles, designated “R” and
“r”. The “R” allele is dominant and determines the round seed shape phenotype and the
“r” allele is recessive and determines the wrinkled seed shape phenotype. Consider a
cross of two pea plants, one with purple flowers and round seeds and one with purple
flowers and wrinkled seeds. In genotypic terms the cross is: Pp/RR x Pp/rr. (show a
fork line diagram to support your answer)
a) Out of 1000 progeny from this cross, how many plants do you expect to have white
flowers and wrinkled seeds?
b) Out of 1000 progeny from this cross, how many plants do you expect to have white
flowers and round seeds?
c) Out of 1000 progeny from this cross, how many plants do you expect to have purple
flowers and round seeds
d) Out of 1000 progeny from this cross, how many plants do you expect to have the
genotype of Pp/Rr
5. What was the genotype of your P1 orange/mackerel cat in exercise #3? What is your
evidence for assigning this genotype