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pishuonlain [190]
3 years ago
15

Sister chromatids are not bivalent and therefore cannot form tetrads. The synaptonemal complex is the fusion of the sister chrom

atids at the start of Meiosis I. If two chromosomes have similar positions, structures, and origins they are referred to as sister chromatids. Syanpsis is the fusion of chromosomes at the start of Meiosis I. A chiasma (or chiasmata) is the place where crossing over occurs. Crossing over is an event that occurs in Meiosis II and results in the exchange of genetic information between sister chromatids. 1) True 2) False
Biology
1 answer:
baherus [9]3 years ago
5 0

Answer:

HI SISTERS! ITS JAMES CHARLES HERE

Explanation:

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Genetically modified (GM) foods make it possible to produce more food on less land. However,
Nuetrik [128]

Explanation:

<u>d. The high cost of GM seeds may force small farmers out of business.</u>

Modified crops have been patented and marketed by private companies. The seeds produced have been sold to many small farmers with the promise of improved yields and hardy crop. However, the high cost of repurchasing seeds may often be prohibitive to small farmers hoping to keep their businesses afloat.

Further Explanation:

Genetically modified species (GMs) have their DNA altered or improved through genetic engineering methods usually GMOs include modifications in DNA through the incorporation of genes from all creatures such as plants, fungi, viruses and animals. These are referred to as transgenic organisms, which lead to several developments by increasing global food security which is the supply of food for the entire population.

GM crops are believed to be more robust in nutritional value and taste, immune to adverse weather conditions such as droughts. These can be resistant to pests, and should reduce the use of herbicides and pesticides

Learn more about DNA at brainly.com/question/12572965

#LearnWithBrainly

8 0
3 years ago
Rank each of the following events of the ovarian cycle in chronological order using #1 to identify the earliest event. 61 Rank t
denis23 [38]

Answer:

1. The follicular phase begins

2. FSH stimulates the maturation of follicles  

3. Estradiol increases the dominant follicle's sensitivity to the gonadotropins

4. FSH secretion diminishes and non-dominant follicles degenerate.

5. A surge in LH stimulates the primary oocyte in the dominant follicle to complete meiosis

6. The secondary oocyte is formed and the dominant follicle ruptures (ovulation).

7. The follicle collapses and bleeds and becomes the corpus luteum.

8. The corpus luteum secretes progesterone helping to prepare the uterus for a possible fertilization

Explanation:

Ovocites production in all vertebrates is cyclic. It involves hormones interaction and changes in follicular cells and uterine walls. The hypothalamus is in charge of this cycle, and the hormones involved are the estrogens and progesterone, hypophysis hormones FSH and LH, and the hormone that releases gonadotrophins GnRH. In reduced concentrations, estrogens act by negative feedback inhibiting the production of FSH, GnRH, and LH. In high concentrations, by positive feedback, estrogens stimulate the GnRH secretion and enhancing the synthesis of FSH and LH hormones. Under the high concentration of progesterone, the secretion of all these hormones is inhibited.    

At the beginning of the menstrual cycle, the hormonal levels are low. After a few days, oocytes and follicles start to maturate under the influence of the gonadotrophic hormones FSH and LH. As the follicle increases in size, it secretes estrogen that stimulates the endometrium´s regeneration to make the fertilized ovule implantation possible. The rapid increase in estrogens level in the middle of the cycle provokes an increase in LH release, which also stimulates the oocyte release (ovulation) that goes to the uterus. Under the stimulation of the LH, the follicle cells increase in size and produce the luteal body. Cells of this last one increase in size and secrete progesterone and estrogen. The high levels of these two hormones inhibit the secretion of  GnRH and thus the secretion of FSH and LH.      

If there is not fertilized and implanted egg, the luteal body is reabsorbed and the production of the ovarian hormones decreases. Under low hormones concentration, the endometrium loses part of its wall by eliminating as the menstrual fluid. When the ovarian hormones decrease, hypophysial gonadotrophic hormones increase again followed by the development of a new follicle and the increase in estrogen levels when the cycle starts all over again.

4 0
3 years ago
Hepatitis, HIV, and herpes are examples of _____.
Mamont248 [21]

Answer:

Viruses?

Explanation:

8 0
2 years ago
Read 2 more answers
What is something you learned about movement across the membrane
emmainna [20.7K]

Answer:

Membrane transport is essential for cellular life. As cells proceed through their life cycle, a vast amount of exchange is necessary to maintain function.

Explanation:

5 0
2 years ago
describe a situation in nature where genetic drift might be a more important influence on evolution than natural selection.
inna [77]

Answer:

Example of genetic drift

Explanation:

a population of rabbits with alleles B and b, both alleles are present in equal frequencies p = 0.5 and q = 0.5 if 10 parents reproduce the probability of having an offspring with alleles B or b is 0.5; however, by chance, a slight difference in the offspring allele frequency might occur due ...

4 0
2 years ago
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