#15. Use the following information to answer the next two questions.
All Vulcans have pointed ears (P) and a right-sided heart (R) which are dominant over Earthling alleles of rounded ears (p) and a left-sided heart (r). Both Vulcans and Earthlings are homozygous for each allele.
Mr. Spock has a Vulcan father and an Earthling mother.
Gametes produced by an individual that are the same as the gametes contributed by each parent to produce that individual are called parental types.
Gametes that have a combination of parental and maternal alleles are called recombinant types.
Recombinant gametes are the result of independent assortment during Metaphase I if genes are on different chromosomes or crossing over during prophase I if genes are on the same chromosome.
Indicate which of the following gametes produced by Mr. Spock are parental types (1) and which are recombinant types (2) by placing a 1 or a 2 in the blanks above each gamete type.
Number: 1, 2,2,1
Gamete: PR, pR,Pr,pr
#16. Another Vulcan trait that is dominant over Earthling alleles is absence of adrenal glands (A).
The genes for ear shape (P/p) and heart sidedness (R/r) are 20 map units apart on chromosome 7. The gene for adrenal glands (A/a) is on chromosome 3.
If Mr. Spock fathers a child with an Earthling female, what are the chances that the child will have pointed ears and adrenal glands?
Select one:
a. 25%
b. 10%
c. 50%
d. 20% i have c as an answer i have no clue if i did it right or not can you help me out?
#17. Two genes called TE and X1 were studied in a lab. 45 out of 500 offspring from crosses involving these two genes had recombinant genotypes.
What is the recombinant frequency of the genes TE and X1?
Select one:
a. 50%
b. 4.5%
c. 9%
d. 18%
#18. Two genes, N and O, are 27 map units apart. If parents heterozygous for these genes were test crossed, and 500 offspring resulted, how many would be recombinants for genes N and O?
Select one:
a. 27
b. 315
c. 140
d. 135
e. 130
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