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CBSE

Biology

NEET Biology : Principles of Inheritance and Variation

271.

Choose the wrong statement

In grasshopper, besides autosomes males have only one X-chromosome, whereas females have a pair of X-chromosomes.
In XY type of sex determination, both males and females have same number of chromosomes.
In Drosophila, males have one X and one Y chromosome, whereas females have a pair of Xchromosome besides autosomes
In birds, females have one Z and one W chromosomes, whereas males have a pair of Z chromosomes besides autosomes
In birds, females have one Z and one W chromosomes, whereas males have a pair of Z chromosomes besides autosomes

272.

Two pink flowered snapdragon plants(Rr) are self-pollinated. The probability of the off springs to have white flowers are

273.

In sickle cell anemia, the sequence of amino acids from the first to the seventh position of the b-chain of haemoglobin S(HbS) is

274.

An example for codominance

275.

Which of the following disorder is caused by autosomal aneuploidy?

276.

$\frac{1}{4}$ TT : $\frac{1}{2}$ Tt : $\frac{1}{4}$ tt is the binomial expansion of

${(\frac{1}{2} T + \frac{1}{2} t)}^{2}$
${(\frac{1}{4} T + \frac{1}{4} t)}^{2}$
${(\frac{1}{4} T + \frac{1}{2} t)}^{2}$
${(\frac{1}{2} T + \frac{1}{4} t)}^{2}$
${(\frac{1}{2} T + \frac{1}{4} t)}^{2}$

277.

Identify the scientists from the hints given below

They used chromosome movement to explain Mendel's lay
They noted that the behaviour of chromosome was parallel to the behaviour of genes.

278.

The disorder caused by point mutation is

279.

Choose the wrong statement

Failure of segregation of chromatids during cell division results in aneuploidy
Additional copy of 'X' chromosome in males results in Klinefelter's syndrome
Closely located genes in a chromosome always assert independently resulting in recombinants
According to Mendel, recessive character never blend in heterozygous condition
According to Mendel, recessive character never blend in heterozygous condition

280.

When mendel self-hybridised the F₁ plants of genotype RrYy, in the F₂ generation they yellow and green colour segregated in the ratio

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