week 4 genetics

Question 1

lamark and evolutionq

Answer 1

animals, across their lifetime work towards particular biological features in persuit of sustenance, survival and reproduction

evolution by use vs disuse

Giraffe example:
original short neck, keep stretching to reach higher leaves, neck progressively becomes longer

Question 2

alles

Answer 2

2 gene possibilities that control the same trait

Question 3

homozygou vs hetrozygous

Answer 3

homozygous = 2 identical alleles
hetrozygous = 2 different alleles

dominant gene = strong effect in either homo or hetro condition

recessive gene = efect only in the homo condition

phenotype = observable trait
genotype = genetic makeup

Question 4

humans have between

Answer 4

20,000 and 25,000 genes

and humans have 23 matched chromosomes =
22 autosomes, 1 pair of sex chromosomes

Question 5

dominant vs recessive trait

Answer 5

dominant = more likely in females as twicde the chance
recessice = less likely in females as they need recessive gene on both x chromosomes e.g. colur blindness

Question 6

Epigenetics

Answer 6

Epigenetics is the study of how behaviors and environment can cause changes that affect the way your genes work1. Epigenetic changes are modifications to DNA that regulate whether genes are turned on or off2. Unlike genetic changes, epigenetic changes are reversible and do not change your DNA sequence, but they can change how your body reads a DNA sequence1.