Biology Core 1 2 3 Flashcards
True or false-in humans, chromosomes are usually found in groups of four?
False.
Where are chromosomes found within a cell?
In the genetic material in the nucleus.
What are alleles?
Different versions of the same gene.
What does the word genotype mean?
Genotype is all the characteristics a person has.
What does the word phenotype mean?
Phenotype is all the characteristics a person shows.
Is a persons wight determined by their genes, the environment or a combination of both?
A combination of both.
Name the two sex cells.
Sperm and egg.
How many chromosomes are found in sex cells?
23 pairs each.
Why do children look a bit like both parents but not identical to either?
Because they’ve only got half the amount of alleles from each parent not all of them.
What’s the difference between homozygous and heterozygous?
Homozygous is where you have two same alleles and heterozygous means when you have two different alleles.
What sex chromosomes do human males have?
XX
What’s the allele for cystic fibrosis recessive or dominant?
Recessive.
What are the symptoms for cystic fibrosis?
Thick sticky mucus in the air passages and breathing difficulty.
What are the symptoms of Huntington’s disease?
Tremors and clumsiness.
What’s the chance of a child inheriting Huntington’s disease if one of their parents have one copy of the faulty allele?
There’s 50% chance of the child inheriting the faulty allele.
