In humans, XXY and XO individuals are A male and female respectively B female an
ID: 81820 • Letter: I
Question
In humans, XXY and XO individuals are A male and female respectively B female and male respectively C males only D females only E lethal 7) How many types of gametes will an individual of the genotype AaBBCcDDEEFfGG produce? A 2 B 4 C 8 D 16 E 32 8) What fraction of the progeny will be dominant for all three traits in a cross between AaBbCc times AaBbcc (Upper case is dominant to lower case and all three genes are unlinked) A 27/256 B 9/64 C 3/64 D 27/64 E 1/217 9) Which of these statements is false? A Homologous chromosomes are found in diploids B Homologous chromosomes do not pair during metaphase of meiosis II C Homologous chromosomes are genetically identical D Physical exchange of the DNA occurs between homologues during pairing E Sister chromatids are identical to one another 10) Flies homozygous for the delta mutation have curved wings. Flies homozygous for the wild type allele of this gene have normal wings. The delta mutation behaves as a A recessive B co-dominant C incomplete dominant D more information needed E lethal mutation 11) Alice is a woman whose father suffers from hemophilia (an X-linked trait). Alice's mother's family has no history of hemophilia. The likelihood that Alice is a carrier of hemophilia is A 100% B 66.6% C 50% D 25% E 0%Explanation / Answer
Answer:
6). A. Male and female respectively
Explanation:
Humans: XX = female; XY = male
Humans: XXY = male; XO = female
7). C. 8
ABCDEFG
ABCDEfG
ABcDEFG
ABcDEfG
aBCDEFG
aBCDEfG
aBcDEFG
aBcDEfG
8). D. 27/64
A_B_C_ = 3/4 * 3/4 * 3/4 = 27/64
9). C. Homologous chromosomes are genetically identical
Since homologous chromosomes are not identical and do not originate from the same organism, they are different from sister chromatids. Sister chromatids result after DNA replication has occurred, and thus are identical, side-by-side duplicates of each other.
10). ---
11). A. 100%
All females are carrier and all males are normal.
(Xh Y) Father x Mother XX-----Parents
X
Xh
X Xh (carrier female)
Y
XY (normal male
X
Xh
X Xh (carrier female)
Y
XY (normal male