For a person to develop Huntington's disease, he must be homozygous (HH) or heterozygous (Hh) for the dominant allele.
<h3>What are the possible genotypes and phenotypes?</h3>
Huntington’s disease is a type of defective dominant disease. This means that any person having 1 or 2 defective dominant genes, have the disorder. But, if a person has 2 recessive genes, they are normal.
Mom (Hh) x Dad (Hh)
H h
H HH Hh
h Hh hh
- Genotypes: HH, Hh, hh (1:2:1)
- Phenotype: Huntington’s disease, Normal (3:1)
- Genotypic percent: 25% HH, 50% Hh, 25% hh
- Phenotypic percent: 75% Diseased, 25% normal
Cystic fibrosis is a type of a recessive disease i.e., a person having 1 or 2 dominant genes is normal. But a person having 2 mutated recessive genes are diseased.
- Normal: CC, Cc
- Cystic fibrosis: cc
- Homozygous normal: CC
- Heterozygous normal: Cc
- Homozygous cystic fibrosis: cc
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Adolescence is that period between childhood and adulthood when some changes seem to happen on/ in the body
Answer:
Cancer is caused by accumulated damage to genes. Such changes may be due to chance or to exposure to a cancer causing substance. The substances that cause cancer are called carcinogens. Occupational risk factors, including carcinogens such as many chemicals, radioactive materials and asbestos.
Explanation:
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Answer:
d. whether or not the traits were inherited from a common ancestor
Explanation:
Homology is a term used in the evolution biology to describe similar traits among two or more different species that came from a common ancestor species. On the other hand, homoplasy also refers to similar traits among different species but that evolved independently.
An example of homology are the forelimbs of frogs, birds, rabbits, and lizards.
An example of homoplasy is the eye.
Tap Root. Plants with a tap root system have a large dominant central root where other lateral roots sprout. These lateral roots are called secondary roots. Examples of plants with taproot system are: sugar beet, parsnip, carrots, radish, dandelion and beetroot.