Question

1. the gametes of a white - tailed deer have 35 chromosomes. when the sperm of a white - tailed buck combines with the egg of a white - tailed doe, how many chromosomes would the zygote have?

a. 17.5 chromosomes
b. 35 chromosomes
c. 70 chromosomes
d. 140 chromosomes

1. what usually combines during fertilization?

a. zygotes c. gametes
b. embryos d. diploid cells

1. which of the following shows the series of events in human development?

a. embryo → zygote → sperm + egg → fetus
b. sperm + egg → fetus → zygote → embryo
c. zygote → fetus → embryo → sperm + egg
d. sperm + egg → zygote → embryo → fetus

1. what allows a zygote to develop into an embryo?

a. the zygote dividing by mitosis over several weeks
b. the zygote dividing by meiosis over several weeks
c. the zygote developing into gametes through mitosis over several weeks
d. the zygote fusing with another zygote and then dividing by meiosis over several weeks

1. which of the following is associated with sexual reproduction?

a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii, and iii

Explanation:

• Question 11: Gametes are haploid. When sperm (haploid) combines with egg (haploid), the zygote is diploid. If gametes have 35 chromosomes (haploid), diploid zygote has \(35\times2 = 70\) chromosomes.
• Question 12: Fertilization is the process where gametes (sperm and egg) combine. Zygotes are formed after fertilization, embryos develop from zygotes, and diploid cells are not what combine during fertilization.
• Question 13: Human development starts with sperm + egg (fertilization) forming zygote, then zygote develops into embryo, and embryo into fetus.
• Question 14: Zygote divides by mitosis (cell division that maintains chromosome number) to develop into an embryo. Meiosis reduces chromosome number (for gamete formation), and zygote doesn't fuse with another zygote or develop into gametes in this context.
• Question 15: Meiosis is involved in gamete formation (part of sexual reproduction), fertilization is the union of gametes (key in sexual reproduction). Pollination is in plants (but still related as it can lead to sexual reproduction in plants where male gametes are transferred).

Answer:

1. C. 70 chromosomes
2. C. gametes
3. D. sperm + egg → zygote → embryo → fetus
4. A. the zygote dividing by mitosis over several weeks
5. D. I, II, and III