Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
If the frequency of homozygous dominant individuals ($p^2$) in a population is 0.36, what is the frequency of the dominant allele (p)?
Given $p^2 = 0.36$. To find p, take the square root of $p^2$. So, $p = \sqrt{0.36} = 0.6$.
The term 'gene pool' in the context of the Hardy-Weinberg principle refers to:
The text defines 'gene pool' as 'total genes and their alleles in a population'.
Which type of natural selection leads to more individuals acquiring character values other than the mean character value?
Natural selection can lead to 'directional change (more individuals acquire value other than the mean character value)'. Stabilising selection leads to more individuals acquiring the mean character value, and disruptive selection leads to more individuals acquiring peripheral character values at both ends.
In a population, if the frequency of allele 'a' ($q$) is 0.2, what is the frequency of homozygous recessive individuals ($aa$)?
The frequency of homozygous recessive individuals is $q^2$. Given $q=0.2$, then $q^2 = (0.2)^2 = 0.04$.
Which of the following events strictly indicates the onset of a new menstrual cycle?
The menstrual cycle starts with the menstrual phase, when menstrual flow occurs. This flow marks the beginning of a new cycle after the degeneration of the corpus luteum in the absence of fertilization. (Refer to paragraph 1, page 34: 'The cycle starts with the menstrual phase, when menstrual flow occurs...').
What is the approximate duration of the menstrual flow during the menstrual phase?
The menstrual flow occurs during the menstrual phase and typically lasts for 3-5 days. (Refer to paragraph 1, page 34: 'The cycle starts with the menstrual phase, when menstrual flow occurs and it lasts for 3-5 days.').
Lack of menstruation can be indicative of pregnancy, but what other conditions can also cause it?
While lack of menstruation (amenorrhea) can indicate pregnancy, it 'may also be caused due to some other underlying causes like stress, poor health etc.' (Refer to paragraph 1, page 34).
Which phase of the menstrual cycle is characterized by the regeneration of the uterine endometrium through proliferation?
During the follicular phase, 'simultaneously the endometrium of uterus regenerates through proliferation.' (Refer to paragraph 2, page 34).
Which hormone primarily induces the rupture of the Graafian follicle and subsequent ovulation?
Rapid secretion of LH leading to its maximum level during the mid-cycle, called the LH surge, induces rupture of Graafian follicle and thereby the release of ovum (ovulation). (Refer to paragraph 1, page 35).
What is the primary function of the corpus luteum during the luteal phase?
The corpus luteum secretes large amounts of progesterone, which is essential for maintaining the endometrium for potential implantation. (Refer to paragraph 1, page 35).
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