life science week 4&5

27 terms by baileybarrington 

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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

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