47. using the figures above answer the following questions
which figure(s) show the process of recombination (crossing over)
which figure(s) show the creation of sister chromatids?
which figure(s) involves the process that occurs in one parent cell?
which figure(s) have double stranded dna?
unit 2: instructional sequence 4
sc.912.l.16.13 describe the basic anatomy and physiology of the human reproductive system. describe the
process of human development from fertilization to birth and major changes that occur in each trimester of
pregnancy.
48. what are the parts and functions of the male reproductive system?

49. what are the parts and functions of the female reproductive system?

50. describe the process of human development from fertilization to birth.

Question

47. using the figures above answer the following questions
which figure(s) show the process of recombination (crossing over)
which figure(s) show the creation of sister chromatids?
which figure(s) involves the process that occurs in one parent cell?
which figure(s) have double stranded dna?
unit 2: instructional sequence 4
sc.912.l.16.13 describe the basic anatomy and physiology of the human reproductive system. describe the
process of human development from fertilization to birth and major changes that occur in each trimester of
pregnancy.
48. what are the parts and functions of the male reproductive system?

49. what are the parts and functions of the female reproductive system?

50. describe the process of human development from fertilization to birth.

Accepted Answer

### Question 47 (sub - questions)
#### 1. Which figure(s) show the process of recombination (crossing over)?
# Brief Explanations:
Recombination (crossing over) occurs when homologous chromosomes exchange genetic material. In the given figures, Figure 2 shows homologous chromosomes with segments that appear to be exchanged, indicating crossing over.
# Answer:
Figure 2

#### 2. Which figure(s) show the creation of sister chromatids?
# Brief Explanations:
Sister chromatids are created during DNA replication, where a single chromosome duplicates to form two identical chromatids. Figure 1 shows a single chromosome (A) becoming two sister chromatids (A1 and A2), representing the creation of sister chromatids.
# Answer:
Figure 1

#### 3. Which figure(s) involves the process that occurs in one parent cell?
# Brief Explanations:
Processes like DNA replication (creation of sister chromatids) and crossing over (recombination) occur within a single parent cell. Figure 1 (sister chromatid creation) and Figure 2 (crossing over) occur within one parent cell. Also, the first row of figures (showing chromosome changes) can be considered as processes within a parent cell. But more precisely, Figure 1 and Figure 2 are involved in processes within one parent cell.
# Answer:
Figure 1, Figure 2

#### 4. Which figure(s) have double - stranded DNA?
# Brief Explanations:
After DNA replication (when sister chromatids are formed) and during processes like crossing over, the chromosomes have double - stranded DNA. All the figures (Figure 1, Figure 2, Figure 3 and the top - row figures) show chromosomes which have double - stranded DNA (since chromosomes are made of DNA which is double - stranded in the cell cycle stages shown here).
# Answer:
Figure 1, Figure 2, Figure 3 (and the top - row figures)

### Question 48: What are the parts and functions of the male reproductive system?
# Brief Explanations:
- **Testes**: Produce sperm (male gametes) and secrete testosterone (male sex hormone).
- **Epididymis**: Stores and matures sperm.
- **Vas Deferens**: Transports mature sperm from the epididymis to the urethra.
- **Seminal Vesicles**: Produce a fluid that nourishes and helps transport sperm (part of semen).
- **Prostate Gland**: Secretes a fluid that contributes to semen, helping to nourish and protect sperm.
- **Urethra**: Transports semen (containing sperm) out of the body during ejaculation and also transports urine (but not at the same time).
- **Penis**: Delivers sperm into the female reproductive tract during sexual intercourse.
# Answer:
- Testes: Produce sperm and testosterone.
- Epididymis: Store and mature sperm.
- Vas Deferens: Transport mature sperm.
- Seminal Vesicles: Produce fluid for semen.
- Prostate Gland: Secrete fluid for semen.
- Urethra: Transport semen and urine (not simultaneously).
- Penis: Deliver sperm during intercourse.

### Question 49: What are the parts and functions of the female reproductive system?
# Brief Explanations:
- **Ovaries**: Produce eggs (female gametes) and secrete estrogen and progesterone (female sex hormones).
- **Fallopian Tubes (Uterine Tubes)**: Transport eggs from the ovaries to the uterus; the site of fertilization.
- **Uterus**: The site of implantation of a fertilized egg, and where the embryo/fetus develops during pregnancy.
- **Cervix**: The lower part of the uterus that connects to the vagina; allows passage of sperm into the uterus and of the baby during childbirth.
- **Vagina**: Receives the penis during sexual intercourse, is the birth canal during childbirth, and is the passage for menstrual flow.
- **Vulva**: External female genitalia, protects the internal reproductive organs.
# Answer:
- Ovaries: Produce eggs and female hormones.
- Fallopian Tubes: Transport eggs and site of fertilization.
- Uterus: Implantation and fetal development site.
- Cervix: Connects uterus to vagina, passage for sperm and baby.
- Vagina: Receives penis, birth canal, menstrual flow passage.
- Vulva: Protects internal organs.

### Question 50: Describe the process of human development from fertilization to birth.
# Brief Explanations:
1. **Fertilization**: A sperm cell fertilizes an egg cell in the fallopian tube, forming a zygote.
2. **Cleavage**: The zygote undergoes rapid cell division (mitosis) as it travels down the fallopian tube, forming a morula (a ball of cells).
3. **Blastocyst Formation**: The morula develops into a blastocyst, which is a hollow ball of cells with an inner cell mass (which will form the embryo) and an outer layer (trophoblast, which will form the placenta).
4. **Implantation**: The blastocyst implants into the lining of the uterus (endometrium) around 6 - 10 days after fertilization.
5. **Embryonic Development (Weeks 3 - 8)**: The inner cell mass differentiates into the three germ layers (ectoderm, mesoderm, endoderm) which give rise to all the body's tissues and organs. Major organ systems begin to form (organogenesis).
6. **Fetal Development (Weeks 9 - 38)**: The embryo is now called a fetus. The fetus grows in size, and organs mature. During the first trimester, major organ systems form. In the second trimester, the fetus becomes more active, and organs continue to mature. In the third trimester, the fetus gains weight, and the lungs mature in preparation for breathing outside the womb.
7. **Labor and Birth**: Hormonal changes trigger labor. The uterus contracts, the cervix dilates, and the baby is pushed out through the vagina (or via cesarean section).
# Answer:
1. Fertilization: Sperm fertilizes egg in fallopian tube to form zygote.
2. Cleavage: Zygote divides into morula.
3. Blastocyst: Morula becomes blastocyst, travels to uterus.
4. Implantation: Blastocyst implants in uterine lining.
5. Embryonic Dev (Weeks 3 - 8): Germ layers form, organogenesis starts.
6. Fetal Dev (Weeks 9 - 38): Fetus grows, organs mature (trimesters: 1st - organ formation; 2nd - growth/activity; 3rd - weight gain/lung maturity).
7. Labor/Birth: Hormones trigger labor, baby is born.

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QUESTION IMAGE

Question

Explanation:

Question 47 (sub - questions)

1. Which figure(s) show the process of recombination (crossing over)?

Answer:

2. Which figure(s) show the creation of sister chromatids?