Unformatted text preview: 113 Unit Ttum; Bandits
15. Suppose that alleles for a sex-linked character for
wing shape in Droscphile show incomplete domi-
If for round wings, and r” X’ individuals have
oval wings. In a crossbetween an oval-winged fe-
male and a round—winged male, the following off—
spring were observed: oval-winged females,
round-winged females, pointedeinged males,
and round-winged males. A rare pointed-winged
a. acrossoverbetween thetwox chromosome
c. a nondisjunction in meiosis 11 between two Xl'
d. a nondisjunction in meiosis 1 between the If
and Xr chromosomes
e. anxl'ﬂfemaleformedwhenanxl' owmwas
felﬁlizedbyra sperm inwhichthere was nosex
chromosome due to a nondisjunclion
16. What is the function of the gene SR1"? a. codes for an RNA molecule that costs the X
chromosome and initiate; X-inactivstlon aftaae'oinnanatﬁaaea its Y chrome" ""‘me' '
c. codes for a protein that regulates genes that
control the development of ovaries d.locatedonthe‘t'elu'omosomeandcodesfora
protein that regulates genes that control develv
opment of testes e. located on the Y chromosome and required for
production of nonnal sperm 1?. A mutation in a mimchondrial gene has been
linlced to a rare musde—wasting disease. This dis-
ease 15- a. found more often in males than females. b. foundmoreoftentnfemalesthanmalee. c. inherited in a simple Mendelian fashion. d. caused bra translocation cfanuclear gene.
e. inherited homthe mother. 18. In wtu'ch of thefollowirtg would youexpect to ﬁnd
a Barrbod'jr? manomim hasperm c. aliveroellofaman
e. amitochondrion A cross between a H'lld'tjfpe mouse and a dwarf
mouse homozygous fora recemive mutation in the 13;! gene produces heterozygotes offspring that
dwarf if the dwarf parent was the father. ‘t'iil'dchof
the following explains these results?
a, sex-linked inheritance
c. genomic imprinting by the mother
:1. inheritance of n'dhoehortﬁrial gem
e. a mutant XIST allele
on. Which of the followingsoste'ments ismttrue about
a. Recombination of linked genes occurs by cross-
-__. _ HEW ._ . .._. ..
b. Recomht' " nation inf-unlinked" gétleamomn'ﬁ ' “ Hilli-
dependent assortment of chromosomes.
a. Genetic recombmation results in oﬂspring with
combinations of traits that differ from the phe- notypes of both parents. d. Recombinant offspring outnumber parental-
apart on a chromosome. e. The numberof recombinant offspring is proper.
a chromosome. 19. ...
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- Spring '11