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.
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2- Sex chromosome X is âĶâĶâĶâĶâĶâĶâĶâĶâĶ than Y
longer
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baam
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rocket
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gift
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thief
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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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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
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4-Males have âĶâĶâĶâĶâĶâĶâĶ sex chromosomes.
XY
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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
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5- In baldness, the male and female with the same genotype have âĶâĶâĶâĶâĶ. phenotype.
different
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boom
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gift
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shark
Other team loses 25 points!
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lifesaver
Give 15 points!
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lifesaver
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seesaw
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fairy
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baam
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3-Females have âĶâĶâĶâĶâĶâĶâĶ sex chromosomes.
XX
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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.
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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
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20- X-linked traits as color blindness appear more in males than in females a-True b-False
a-True
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thief
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rocket
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fairy
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thief
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10-âĶâĶâĶâĶâĶâĶ. is a chart used to follow the inheritance of a certain trait within a family.