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Review for Genetics Test. 1. The observed trait that appears in an organism as a result of its’ genetic makeup is called an organisms_____________. phenotype. 2. IF R= round and r= wrinkled, cross a homozygous dominant with a heterozygous, what will be the phenotypic ration of the offspring? - PowerPoint PPT Presentation
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1
• The observed trait that appears in an organism as a result of its’ genetic makeup is called an organisms_____________.
• phenotype
2
• IF R= round and r= wrinkled, cross a homozygous dominant with a heterozygous, what will be the phenotypic ration of the offspring?
• 100% round
3
• If a female fruit fly heterozygous for red eyes XRXr crossed with a white eyed male XrY what percentage of their offspring would have white eyes?
• 50% will have white eyes
7
• Cancer is a disorder in which some cells have lost the ability to control their ________.
• Growth rate
8
• An organism has a haploid number of 5 How many chromosomes will be in each of their body cells?
• 10
9
• The chromosome number associated with an organism’s somatic cells is 12. How many chromosomes will this organism produce in its gametes after Meiosis?
• 6
11
• Homologous chromosomes are pairs of chromosomes containing genes that code for _____________.
• The same traits
12
• Unlike mitosis, meiosis results in the formation of __________.
• 4 genetically different cells
14
• The 2nd phase of interphase is called S for synthesis, why is this a good name for this stage?
• Because DNA synthesis takes place, each chromosome makes an identical copy
15
• If nondisjunction occurs ________.
• A gamete will receive too many or too few chromosomes, result is called aneuploidy
22
• Name the genetic disorder-• Autosomal recessive disorder of the
hemoglobin gene. This disorder results in crescent shaped red blood cells that can get lodged in the vessels and can cause severe pain.
• Sickle Cell Anemia
23
• Name the genetic disorder• Rare autosomal recessive disorder that is
caused by an error in the metabolism of either lipids or amino acids causing them to build up in the brain causing severe mental impairments
• Tay-sachs or PKU
24
• Name the genetic disorder• Autosomal recessive disorder that results in a
mucus build up in the lungs which causes the patient to have breathing and oxygen issues.
• Cystic Fibrosis
25
• Name the genetic disorder• Sex-linked recessive disorder effecting the
clotting factors of the blood.
• Hemophilia
26
• Name the genetic disorder• Autosomal dominant disorder in which adults
are typically the victims. The disorder is a degenerative disorder that causes a range of brain abnormalities later in life.
• Huntington’s Disease
27• If individual III-2 marries a person with the
same genotype as individual II-4 what is the chance that one of their children will be afflicted with hemophilia?
• 50%