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fenix001 [56]
3 years ago
13

Dihybrid Practice Problems

Biology
1 answer:
Lisa [10]3 years ago
3 0

Answer:

a. Genotype of the parents are; Rr and rr

b. Please find the explanation to A below

Explanation:

This question involves a single gene that codes for flower color in a plant. The allele for red flower (R) is dominant over the allele for white flower (r). This means that a plant that is heterozygous for flower color (Rr) will be red.

In a cross between a plant with red flowers and white flowers, the phenotype of the offsprings is represented as: 37 plants with red flowers and 41 plants with white flowers. Observing from this number, one would realize that the phenotype ratio is equivalent to 1:1. This phenotypic ratio is only possible when the parent with red flower is heterozygous for the gene i.e. Rr. Hence, the genotype of the parents are: Rr and rr.

b) If one were to cross Rr (red flower) × rr (white flower), the phenotypic ratio of red to white offsprings will be 1:1. Hence, judging from the ratio got from the cross of the two parents above (1:1), the parental genotypes are Rr and rr.

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If the average length of a woman's ovarian cycle is 30 days, the average length of her uterine cycles is most likely ____ days.
dybincka [34]

If the average length of a woman's ovarian cycle is 30 days, the average length of her uterine cycles is most likely 28 days.

<h3>What is the ovarian cycle?</h3>

The female ovarian cycle refers to the sequence or cycle that controls the production and release of eggs as well as the the monthly secretion of the hormones estrogen and progesterone.

Hence, if the average length of a woman's ovarian cycle is 30 days, the average length of her uterine cycles is most likely 28 days.

Learn more about ovarian cycle:brainly.com/question/14224887

#SPJ1

6 0
2 years ago
Angiotensin II is a potent ____________ that helps regulate blood pressure. Angiotensinogen, is an inactive hormone synthesized
Hatshy [7]

Answer:

Angiotensin II is a potein VASOCONSTRICTOR that helps regulate blood pressure. Angiotensinogen, is an inactive hormone synthesized and released continuously from the LIVER. Its activation, which occurs within the BLOOD, is initiated by the enzyme renin. Renin is released from the juxtaglomerular apparatus of the KIDNEYS in response to either (1) LOW blood pressure (as detected by decreased stretch of BARORECEPTORS within granular cells, or by decreased NaCl detected by CHEMORECEPTORS within macula densa cells); or (2) stimulation by the SYMPATHETIC  division. The sequential action of renin and angiotensin converting enzyme (ACE) causes the formation of angiotensin II (the active form of the hormone).

Explanation:

Angiotensin is a peptide hormones that regulate blood pressure by causing increase in blood pressure through vasoconstriction. It is a part of the renin- angiotensin system that regulate the internal pressure of the blood. It is stimulated when the level of blood pressure reduces or there is an decrease in the sodium chloride in the blood. It effects is to vasoconstrict the blood vessels thereby increasing the blood pressure in the vessels. Angiotensinogen is the inactive hormone synthesized by the liver and upon activation through baroreceptors or chemoreceptors, the liver releases angiotensinogen into the blood stream to be ctivated by the enzyme secreted from the kidney's juxtaglumerular apparatusand then activated to teh angiotensinogen I, angiotensinoI is then activated into angiotensin II by the angiotensin II by the angiotensin converting enzyme. Angiotensin also causes the increase in the aldosterone secretion from the adrenal cortex to promote the retention of sodium by the kidneys, this also helps to increaee the blood pressure. Various receptors helps in signalling the body to a reduced blood pressure level. This includes the baroreceptors which are pressure receptors and detect changes in pressure of the blood; chemorecptors which are chemical receptors that detect the change in the concentration of sodium and chloride ion in the blood. All this function together with the sympathetic division of the CNS to help the body regulates its change in blood pressure in a given time.

3 0
3 years ago
<img src="https://tex.z-dn.net/?f=what%20%5C%3A%20is%20%5C%3A%20cell%20%5C%3A%20membrane%20%5C%3A%20%20%7B%3F%7D%20" id="TexForm
Volgvan

Explanation:

The living layer of a cell is called cell membrane.

it is also called plasma membrane .

hope it is helpful to you

8 0
3 years ago
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What are a series of large waves generated in the ocean by an earthquake, landslide, and volcanic activity?
Lemur [1.5K]
Seismic Waves should be the one
7 0
4 years ago
Ovulation occurs when a vesicular (graafian) follicles releases an egg. false true
kykrilka [37]
Hi the answer is true.
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3 0
3 years ago
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