bio lab 2 Flashcards

1
Q

what is a allele

A

the many forms of genes a taht are stores in homologous pairs of chromosomes

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2
Q

how are alleles passed

A

they are passed on by homologous chromosomes segregate in meiosis ; each sex cell has one allele

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2
Q

what does fertilization do to diploid cells

A

fertilization brings the diploid cells back up to two copies or alleles for each gene

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3
Q

what is a pedigree

A

a chart that summarizes phenotypes and/or genotypes within a family over several generations

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4
Q

what is a dihybrid cross

A

if both parents are heterozygous for both traits

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5
Q

what are the sex chromosomes

A

in fruit flies and humans the males are XY and the females are XX and this means males only get one x chromosome with a short y chromosome that is not truly homologous to the x chromosome

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6
Q

are autosomal sex chromosome

A

no they are not they are all the other chromosomes

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7
Q

how often do x linked diseases show

A

these are expressed more often in males than in females

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