BNNS502 pt 2 Exam Study Guide 2024
Functions of the nucleus - Ans:-Control cellular structure, directs cellular activity, produces
ribosomes
How many pairs of chromosomes does the body have - Ans:-23
2 chromosomes making up a chromosome pair are called - Ans:-Homologous chromosomes
Allelels ar...
Homozygous vs Heterozygous - Ans:✔✔-Homozygous: Same alleles (PP,pp)
Heterozygous: Different alleles (Pp)
Are genetic disorders Dominant or recessive - Ans:✔✔-Recessive and takes both parents to be carriers
Autosomes vs sex chromosomes - Ans:✔✔-Autosomes: Any chromosome that isn't a sex chromosome
Sex chromosome: 23rd pair (XX or XY)
XX and XY code for - Ans:✔✔-XX: Female
XY: Male
What does the X chromosome contain - Ans:✔✔-Genes important for brain function, clottong factor and
cone pigments
Why are male sex linked traits more common - Ans:✔✔-Because it always expressed because there is no
corresponding allele on Y chromosome, females must have 2 sexlinked recessive alleles
What errors can occur during meiosis - Ans:✔✔-Trisomy (2n+1) or monosomy (2n -1)
Down syndrome occurs when - Ans:✔✔-There is an extra 21st chromosome
What is a teratogen - Ans:✔✔-Any agent or influence that causes developmental defects in the embryo
ie chemicals, drugs, cigarettes, irradition
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