Flashcards in Chap 19 Deck (52)
1) What is a locus?
1. A locus is the location of an allele on a chromosome
2) Approximately how many genes do humans possess?
3) What is each version of a gene called?
4) What is the condition referred to if two copies of a gene are identical alleles?
5) What is the condition referred to if two copies of a gene are different alleles?
6) What is an allele called when that allele's effect on a trait masks that of an allele paired with it?
7) When an allele's effect on a trait is masked by that of an allele paired with it, what is the second allele referred to as?
8) What is the genotype AA referred to as?
8. homozygous dominant
9) What is the genotype aa referred to as?
9. homozygous recessive
10) What is the genotype Aa referred to as?
11) What are the alleles an individual inherits called?
12) What are observable functional or physical traits called?
13) What is the most accurate description of an organism with genotype AaBb ?
14) Gene A occurs on chromosome 5, gene B is on chromosome 21. Therefore, these two parts of the chromosomes can NOT be
15) If two parent organisms have different alleles for a gene that an experimenter wants to test, what test will he or she perform?
15. Test cross
16) What gametes will a parent with the genotype CC will produce?
17) When homologues separate into different gametes after meiosis I, the genes of each pair separate as well. What is this principle called?
18) The principle of segregation applies most specifically to events occurring in preparation of what?
19) What does the theory of segregation deal with?
19. explains the behavior of a pair of alleles during meiosis.
20) If R is dominant to r, the offspring of the cross of RR with rr will have what phenotype?
20. the same phenotype as the RR parent
21) If tall (D) is dominant to dwarf (d), and two homozygous varieties DD and dd are crossed, then what phenotypes of offspring will be produced?
21. all tall
22) If all offspring of a cross have the genotype Aa, what would the parents of the crosses most likely be?
22. AA x aa
23) What is a graphic tool used to determine the probable outcome of genetic crosses called?
23. Punnett square
24) When the first generation parents are homozygous for different alleles, a 3:1 phenotype ratio will most likely appear in which generation of offspring?
25) In a monohybrid cross, what kind of genes "disappear" in the F1 generation?
26) What is the F2 phenotypic ratio of a monohybrid cross?
27) In the cross Cc x Cc, gametes have a ____ chance of receiving either allele.
27. 50 x 50
28) In a Punnett square, what do the letters within the little boxes represent?
28. offspring genotypes
29) If short hair (L) is dominant to long hair (l), then to determine the genotype of a short-haired animal it should be crossed with what genotype animal?