lecture 1-27-16 Flashcards Preview

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Flashcards in lecture 1-27-16 Deck (29)
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1

genetic disease
caused by a single gene mutation
allele of the CFTR gene
abnormally thick mucus builds up in the lungs

cystic fibrosis CF

2

CFTR gene codes transmembrane regulator protein

moves ions in and out of the cell

3

provides instructions for making proteins

gene

4

how are genes inherited?

physically transmitted from parent to offspring

5

two copies of each chromosome (and each gene) in ______organism

diploid

6

homologous chromosomes

one from each parent passed to offspring

7

two copies of genes found on homologues have same function but DNA sequence may differ

may have two different alleles of same gene

8

is the particular genetic or allele makeup of an individual

genotype

9

is the observable or measurable features of an individual

phenotype

10

combination of maternal and paternal alleles
join during fertilization
determines genotype and contributes to phenotype

sexual reproduction

11

special sex cells

sperm and egg

12

reproductive cells that carry one copy of each chromosome -haploid

gametes

13

special cell division needed to reduce from diploid to haploid

meiosis

14

meiosis generates unique ________

haploid gametes

15

haploid sperm fertilizes _____

haploid egg

16

the result of fertilizing the haploid egg is a ________

diploid zygote

17

zygote divides by mitosis into an

embryo

18

-separates homologous chromosomes
-each daughter cell is haploid
-each chromosome still has two sister chromatids

meiosis 1

19

how many separate division steps does meiosis have?

2

20

-separates sister chromatids
-four haploid daughter cells
-develop into egg or sperm

meiosis 2

21

no two gametes are ______

identical

22

when maternal and paternal chromosomes pair and physically exchange DNA segments

recombination

23

alleles of different gene are distributed independently of one another

independent assortment

24

Cf is caused by a

recessive allele

25

two different alleles (Aa)
-phenotype is normal
-individual is a carrier

heterozygote

26

two identical allele

homozygote

27

homozygote dominant (AA)

phenotype is normal

28

homozygous recessive (aa)

phenotype is CF mutant

29

a diagram to determine the probabilities of offspring having particular genotypes
based on genotype of parents
matches up all possible gametes

punnett square