1. when two cells with n number of chromosomes fuse what type of cell results?
- diploid
2. during which process are gametes formed
- meiosis
3. what process results in an exchange of genes between homologous chromosomes
- crossing over
4. how many chromosomes would a cell have during metaphase 1 of meiosis if it has 12 chromosomes during interphase
B. 12
5. which stage of meiosis is illustrated above
D. metaphase 2
6. what is the next step for the chromosomes illustrated above
D. they will divide into sister chromatids
7. which is not a characteristic of homologous chromosomes
C. homologous chromosomes have the exact same type of allele at the same location
8. relate the terms meiosis gametes and fertilization in one or two sentences
- Meiosis is the reduction division that happens in reproductive cells to generate haploid gametes. Gametes are the haploid sex cells that undergo fertilization to form diploid zygote.plant cells do not have centrioles hypothesize why plant cells might not have centrioles
9. Plant cells do not have centrioles but they do contain centrioles. Hypothesize why plant cells might not need centrioles for mitosis or meiosis
- Centrioles is a organelle used in cell division.
10. a horse has 64 chromosomes and a donkey has 62 using your knowledge
- A horse produces gametes with 32 chromosomes and donkey produces gametes with 31 chromosomes. Upon fertilization, the mule will contain 63 chromosomes. So it can not produce gametes with same number, hence infertile.
11. in bees the female queen bee is diploid but the male bees are haploid the fertilized eggs develop into female bees and the unfertilized eggs develop into males how might gamete production in male bees differ from normal meiosis
- Male bees produce gametes without undergo meiosis.
12. dominant, recessive
- dominant traits are showing and the recessive traits are masked.
13. genotype, phenotype
- phenotype is observable and gentotype is not.
14. if a black guinea pig (Bb) were crossed with a white guinea pig (bb) what would be the resulting phenotypic ration
C. 1:1 black to white
15. in garden peas purple flowers (P) are dominant to white (p) flowers and tall plants (T) are dominant to short plants (t) if a purple tall plant (PpTt) is crossed with a white short plant (pptt) what is the resulting phenotypic ratio
D. all purple tall
16. the unusual cat shown was grossed with a cat with noncurled ears all the kittens born from that cross had noncurled ears later when these offsprings were crossed with each other the phenotypic ratio was 3:1 noncurled to

curled ears what conclusions can be made about the inheritance of curled ears
- It is a recessive trait.
17. what might occur in the F3 generation of the curly eared cat shown above if the F2 generation all reproduce with cats that have noncurly ears
- The trait was possibly masked in the F2 generation so some cats in the F3 generation could have curly ears
18. if there are five boys and no girls born into the family does that increase the likelihood of the sixth offspring to be a girl explain
- No. the possibility of male and female birth is always 50% irrespective of the number of births
19. there are two types of american rat terrier dogs those without hair and those with hair as shown in the figure the presence of the hair is genetically determined trait some female rat terriers with hair produce only puppies with hair whereas other females produce rat terrier puppies without hair explain how this can occur
- Production of hair happens in a heterozygous condition. So, the females produce both kind of offspring.
20. what is the probability of couple giving birth to five girls in a row
-3.125%