How can we help?

You can also find more resources in our Help Center.

life science week 4&5

STUDY
PLAY
sexual reproduction results in what?
genetic variability, or diversity, which is important to the survival of species
meiosis
sex cell reproduce
haploid gametes
egg and sperm cells
genotype
genetic make up, what is inherited from parents
genes
units of inheritance
locus
genes own specific location on a chromosome
chromosomes
condensed genetic material
how many chromosomes does every cell have?
2 copies
how many chromosomes does every sex cell have?
1 copy
allele
copy of a chromosome
homologous
each allele holds a different version of the same genetic material
centomere
where a pair of chromosomes is joined together
how many chromosomes does a human have?
23 pairs
autosomal
22 pairs of chromosomes, determine how your body is made
phenotype
genetic expression of your genes
traits
genetic make up tells about you
dominant
which genes are more likely to be expressed
recessive
traits need 2 copies in order for it to be expressed
homozygous genotype
receive same type of gene from both parents
heterozygous genotype
receive one dominant gene from one parent and one recessive gene from the other
homozygous dominant
inherit dominant genes from both parents
homozygous recessive
inherit recessive genes from both parents
punnett squares
used to asses genotype of offspring or determine probability of having a certain phenotype
sex chromosomes
determine if you will be male or female
what are the female chromosomes?
XX
what are the male chromosomes?
XY
down syndrome
due to a mutation in which there are 3 copies of chromosome #21