mendelian inheritance Flashcards Preview

PRINCIPLES OF FUN > mendelian inheritance > Flashcards

Flashcards in mendelian inheritance Deck (15):
1

what gender do sex-linked traits appear in more often?

males

2

what gender do autosomal traits appear in more often?

equal in both sexes

3

if a child has a dominant trait, what will the parents ALWAYS display?

same trait

4

if the child has a recessive trait, can the parents appear normal?

yes, both can be heterozygous

5

what are the 22 pairs of chromosomes that are not sex chromosomes referred to as?

autosomes

6

what are the steps in mitosis?

chromosomes align at the metaphase plate
daughter chromosomes separate
daughter cells form
daughter cells are genetically identical to the parent cell

7

what are the steps in meiosis?

synapsis and crossing over occur
homologues align independently
homologues separate
daughter cells form
daughter chromosomes separate
daughter nuclei are not genetically identical to parent cell

8

what is an allele?

an alternative form of a gene that is located t a specific position on a specific chromosome

9

when would a dominant allele be expressed?

always, even if only one copy of the allele is present

10

what would a recessive allele be expressed?

only shows if the individual has two copies of the recessive allele

11

what is an example of an autosomal dominant condition?

huntingtons disease

12

what is an example of an autosomal recessive disease?

sickle cell anaemia

13

what is an example of a recessive sex linked (X chromosome) condition?

red-green colour blindness

14

what is an example of an X-linked dominant condition?

rett syndrome

15

who do Y linked conditions occur in?

males and all male descendants