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20- X-linked traits as color blindness appear more in males than in females a-True b-False
a-True
19-- Males can be carriers for color blindness. a-True b-False
b-False
19-- Males can be carriers for color blindness. a-True b-False
b-False
19-- Males can be carriers for color blindness. a-True b-False
b-False
18- B+B+ is bald in ............................... a- males and females b- males only c- females only
b- males only
17-Color blindness is X- linked recessive trait : in the Punnett square how many have Color blindness disease ? a- 50 % b- 100 % c- 25 % d-75 %
c- 25 %
16-Colorblindness is a recessive x-linked disorder. Which genotype represents a male with normal vision?
C
15-Who does a son inherit a sex-linked allele from? a-His mother only b-His father only c-Either his father or mother
a-His mother only
14-An individual who is heterozygous for a recessive disorder is called a(n) ………. a-carrier b-pedigree c-autosome d-affected
a-carrier
13-Who could a daughter inherit a sex linked allele from? a-Her mother only b-Her father only c-Either parent
c-Either parent
12-……Is a way to predict all the possible breeding outcomes A-a pedigree B- a phenotype C- a Punnett square
C- a Punnett square
11-Which tool that scientists use to analyze the genetics of a family is shown below?   A-a pedigree    B- a phenotype    C- genetic engineering    D- a Punnett square
Family pedigree
10-………………. is a chart used to follow the inheritance of a certain trait within a family.
Family pedigree
9-Explain : -Color blindness is common in males and rare in females
Because female needs 2 recessive genes of color blindness carried on her two sex chromosome XX but male needs only one.
8-Explain : Baldness is common in males not in females.
Because male sex hormone supports the appearance of baldness But female sex hormone prevents the appearance of baldness.
7-From examples of mutation which is a sudden change in the gene a- Color blindness b- Hemophilia c-both
c-both
6-Traits (genes) located on the sex chromosomes (X) are called ......................
Sex linked traits
5- In baldness, the male and female with the same genotype have ……………. phenotype.
different
4-Males have ………………… sex chromosomes.
XY
3-Females have ………………… sex chromosomes.
XX
2- Sex chromosome X is ……………………… than Y
longer
1-Which is a mutation? A-a factor that causes all human disease B-any gene that is harmful C-a permanent change in a gene D-a piece of recombinant DNA
C-a permanent change in a gene


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