recessive allele. s disease and retinoblastoma are all disorders caused by an au
ID: 198543 • Letter: R
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recessive allele. s disease and retinoblastoma are all disorders caused by an autosomal maximum number of alileles for a single trait that any one "healthy' person can possess is four Due to advances in medicine fairly normal" life, although they are stili susceptible to chest colds, etc. T/F (le a daily mixture of pills, some cystic fibrosis patients can lead a T/F Blood typing can rule out a man as the father, but cannot prove for certain that he is the T/F The vast majority of sex-linked traits are located on the Y chromosome T/F Chemical hormones are produced by endocrine glands in the body, and usually travel in the T/F When high levels of a hormone cause a decreased response and decline in production of the T/F The male erection is due to the contraction of large muscles in the penis T/F During oogenesis, meiosis of an oocyte begins while the fetus is stll in the womb, and does not T/F At the start of the ovarianuterine cyale, Jevels of E and P are low, while levetls of LH and FSH are father. bloodstream to their targets hormone, we say that it is acting under enhancing, or positive feedback complete unless the mature egg is fertilized very high sac property, surgery can easily correct this condition. T/F Cryptorchidism is a conditions where the testes of an infant boy do not descend into the scrotalExplanation / Answer
Q)1 ) PKU , Huntington's disease , Retinoblastoma are all disorders caused by an autosomal recessive allele-
Answer-false
Explanation:- PKU is an autosomal recessive pattern, in this both copies of the gene have to have the mutant PAH gene which causes PKU , it is inherited from both the parents, disorder passed down in recessive pattern, both parents contribute a mutated version of PAH gene.
In Huntington's disease it is caused by HTT gene , this condition is due to Autosomal dominant pattern, it means only one copy of altered gene is sufficient to cause the disorder.
In Retinoblastoma , mutation in RBI gene is inherited in an autosomal dominat pattern.
Q)2) The maximum number of alleles for a single trait that anyone helathy person can posses is four-
Answer- False.
Explanation:- The maximum number of alleles for a single trait in an healthy person is 2 , one allele is given from each parent.
Q)3) Due to advances in medicine ( I.e. a daily mixture of pills ) some cystic fibrosis patients can lead a fairly normal life although they are still succeptible to chest colds.
Answer:- True
Explanation:- Cystic fibrosis is a life-threatening, genetic disease it affects patients’ ability to breathe , it is found that there is always a persistent lung infection in patients. At present it has no cure, there are a variety of treatments, therapeutics, and supplements to help cystic fibrosis patients to maintain their health.Treatment plans are unique and specific to each patient’s specific health criterias and needs.
Q4) Blood typing can rule out a man as the father, but can not proove for certain that he is father-
Answer:- True
Explanation:- In cases of questioned paternity, ABO blood-typing is used to exclude a man from being a child's father. For example, a man who has type AB blood could not father a child with type O blood, because he can pass either the A or the B allele to all of his offsprings. Besides their usefulness in this case, ABO blood groups cannot be used to confirm whether a man is a child's father or not.
A new test developed in 1970, testing for human leukocyte antigens (HLAs) , it acts as a distinguishing feature, and helps in ruling out men as fathers with 80% effectiveness. The genes responsible for the HLA system are involved in antigen presentation to T cells.
Q)5) The vast majority of sex linked traits are located on Y chromosome.
Answer:- False.
Explanation:- Majority of sex linked traits are produced by recessive genes found only on X chromosome, females have two copies of the sex-linked genes, while males have only one copy of this gene. If the gene is recessive, then males require a single recessive gene to have a sex-linked trait rather than usual two recessive genes for traits that are not sex-linked. That's why males shows some traits more frequently than females.
Q6) chemical hormones are produced by endocrine glands in the body , and ususally travel in the blood stream to their targets.
Answer- True
Explanation:- The endocrine system is a collection of glands of an organism which secrete hormones directly into the circulatory system and carried to the distant target organs. In humans, the major endocrine glands are pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, and adrenal glands. Characteristic features of endocrine glands are, they are ductless in nature, shows vascularity, and commonly intracellular vacuoles or granules are present which stores their hormones.
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