Tag: inherited changes

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Questions Related to inherited changes

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

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?

  1. $75$
  2. $50$
  3. $25$

  4. Zero
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To be homozygous tall and bearing yellow flowers, the progeny must have the genotype TT YY. However, the second parent is homozygous recessive (tt yy) and can only contribute recessive t and y alleles to all offspring, making it impossible for any offspring to be homozygous dominant (TT) for the height trait.

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

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

  1. $3'$ATTGACGT$5'$
  2. $5'$TGCAGTTA$3'$
  3. $5'$TUUCTGCU$3'$
  4. $3'$TAACTGCA$5'$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

DNA strands are antiparallel and complementary, with A pairing with T and G pairing with C. Given the 5' to 3' strand 5' ATTGACGT 3', the complementary strand must run in the 3' to 5' direction and have the matching bases: 3' TAACTGCA 5'.

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

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

  1. $100$%
  2. $50$%
  3. $25$%
  4. $0$%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Male pattern baldness is X-linked recessive. If both parents are bald, mother is X^bX^b and father is X^BY. First daughter being normal means she's X^BX^b (heterozygous carrier). Second male child receives Y from father and X from mother. With probability 1, he receives X^b from mother, making him X^bY and bald.

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

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?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

The vascular cambium of a stem does not produce _____.

  1. Cork

  2. Wood

  3. secondary phloem

  4. secondary xylem
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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


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

  1. haploid condition, in genetic terms

  2. pair of non-identical alleles

  3. pair of identical alleles

  4. both (a) and (c)
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.