Tag: biology

Questions Related to biology

Probability of getting fairly light and light progeny from mulattoe and albino parents in

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. $\cfrac{15}{64}$ and $\cfrac{6}{64}$

  2. $\cfrac{20}{64}$ and $\cfrac{15}{64}$

  3. $\cfrac{3}{8}$ and $\cfrac{1}{8}$

  4. $\cfrac{3}{8}$ and $\cfrac{3}{8}$

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Correct Option: A

In an organism punk is a sex-linked recessive trait and black hair heterozygous female is mated to white male which is not spotted, the phenotypic ratio of the offspring would be :

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. 1/4 spotted black; 1/4 pink spotted white; 1/4 unspotted black; 1/4 uspotted white

  2. 1/2 spotted black; 1/2 pink spotted white

  3. 3/4 pink spotted black; 1/4 pink spotted white

  4. 3/4 unspotted black; 1/4 pink spotted white

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Correct Option: A

A man with pure blue eyes and pure black hair marries a woman with black eyes and red hair. (Black eyes are dominant over blue eyes and black hair over red hair). What will be the probabilities of phenotypes of the children?

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. $50$% with black eyes and black hair, and $50$% blue eyes and black hair

  2. All will be with black eyes and black hair

  3. Both the above cases are possible

  4. $1 : 1 : 1 : 1$

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Correct Option: A

A dithered tall plant bearing yellow flowers(Tt\cdot Yy)$ was crossed with a dwarf plant bearing white flowers(tt, yy). What percentage of the progeny is expected to be homozygous tall bearing yellow flowers?

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. $75$

  2. $50$

  3. $25$

  4. Zero

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Correct Option: A

If one chain of a DNP molecule has the base order $5$' ATTGACGT $3$'. Then the base order of its complementary chain will be.

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. $3'$ATTGACGT$5'$

  2. $5'$TGCAGTTA$3'$

  3. $5'$TUUCTGCU$3'$

  4. $3'$TAACTGCA$5'$

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Correct Option: A

Mr. Kapoor has $Bb$ autosomal gene pair and $d$ allele sex-lined. What shall be proportion of $Bd$ in sperms.

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. Zero

  2. $1/2$

  3. $1/4$

  4. $1/8$

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Correct Option: A

If both parents are bald and their first female child is normal, then chances of bald ness is second male child are ________________.

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. $100$%

  2. $50$%

  3. $25$%

  4. $0$%

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Correct Option: A

Choose the correct answer from the alternatives given.
If you had two guinea pigs of opposite sex, both homozygous, one black and one brown, but you didnt know which was the dominant characteristic, how would you find out the dominant colour?

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. Mate them together and see what colour the offspring arethat will be the dominant colour

  2. Mate them together and see what colour the offspring arethe other will be the dominant colour

  3. Mate them together, then mate their offspring to see what colour the grandchildren arethat will be the dominant colour

  4. Mate them together, then mate their offspring to see what colour the grandchildren arethe other colour will be the dominant colour

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Correct Option: A
Explanation:

Since both the guinea pigs are homozygous mating them will result in a heterozygous genotype in the offspring. In the heterozygous condition, the dominant allele has the ability to mask the effect of the recessive allele. Therefore, the phenotypic character that will be expressed will be the phenotype of the dominant character and the F1 progeny color will be the dominant color. So, the correct option is 'Mate them together and see what color the offspring are that will be the dominant color'.

The vascular cambium of a stem does not produce _____.

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. Cork

  2. Wood

  3. secondary phloem

  4. secondary xylem

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Correct Option: A
Explanation:

Cork is produced by cork cambium which is a lateral meristem responsible for secondary growth that replaces epidermis of root and stems. The vascular cambium of a stem is responsible for the formation of secondary phloem and secondary xylem while wood is mainly composed of secondary xylem element it is also a derivative of vascular cambium.

So, the correct option is 'Cork'.


A heterozygote has a .......... for the trait being studied.

biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

  1. haploid condition, in genetic terms

  2. pair of non-identical alleles

  3. pair of identical alleles

  4. both (a) and (c)

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Correct Option: B
Explanation:

An individual having two different alleles of a particular gene or genes, and so giving rise to varying offspring.

So, the correct option is 'pair of non-identical alleles'.