Lesson 7: Inherited dissorders/ sex determination Flashcards

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1
Q

What are inherited dissorders caused by?

A
  • Inherited dissorders are caused by the inheritence of certain alleles.
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2
Q

What is polydaylyl?
What type of allele is polydaylyl caused by?

A
  • WHAT IS IT? - Having extra fingers/ toes.
  • Caused by DOMINANT allele.
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3
Q

What is cystic fibrosis?
What type of allele is cystic fibrosis caused by?

A
  • WHAT IS IT? - A dissorder of cell membranes.
  • Caused by RECESSIVE allele.
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4
Q

What are the issues with embryo screening (screening embryos for the alleles for inherited dissorders?)

A

1.) It is expensive.
2.) Unethical (as some healthy- the one’s that aren’t implanted- embryos are destroyed.)
3.) In future, people may use it to produce offspring with “desirable features.” - unethical/ social issue.

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5
Q

How many chromosomes do ordinary human body cells contain?

A
  • Ordinary human body cells contain 23 pairs of chromosomes (so, 46 chromosomes IN TOTAL.)
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6
Q

What are the 22 pairs of chromosomes in ordinary human cells for? What is one of the pairs in ordinary human cells for?

A
  • The 22 pairs control characteristics only.
  • One of the pairs carries the genes that determine sex.
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7
Q

What are the sex chromosomes for men and women?

A

Men: XY (different chromosomes)
Women: XX (same chromosomes)

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8
Q

If an inherited disease (ie. cystic fibrosis) is caused by a recessive alelle - how must’ve the person inherited it?

A
  • One recessive allele from father, one recessive allele from mother.
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