A test cross of Aa Bb Cc produces how many phenotypes

1. 4

2. 8

3. 12

4. 16

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Heterozygous organisms Bb produce B and b gametes.The change of b combining with b or b are

1. 1/1

2. ½

3. ¼

4. None of these

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An individual heterozygous for two alleles (Aa Bb) Produce one million sperms.How many of the sperms will have both recessive alleles

1. 0.25 million

2. 1 million

3. 2 million

4. 0.5 million

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Correct Answer :

0.25 million

Explanation :
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Which one of the following individuals cannot produce 16 different gametes

1. Aa Bb Cc DD Ee Ff

2. Aa Bb cc DD Ee Ff

3. Aa Bb cc Dd

4. Both (a) and (c)

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Correct Answer :

Both (a) and (c)

Explanation :
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How many different types of phenotypes would be produced in F1 progeny in the following cross that obeys Mendel’s law of independent assortment AA BB CC × aa bb cc

1. 1

2. 64

3. 27

4. 8

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If one gametophyte ferm plant shows characters A and B and is crossed with another plant having a and b then what will be the gametophytic generation (gametes) with respect to these two characters

1. 1 AB:1Ab:1aB:1ab

2. 1 AB:2 AB:1 ab

3. 3 AB:ab

4. 9 AB:3 Ab:3 aB:1ab

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Correct Answer :

1 AB:1Ab:1aB:1ab

Explanation :
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In Andalusian fowl,the heterozygous condition of alleles for black plumage (B) and white (b) is blue.A blue Andalusian fowl is bred to a black Andalusian fowl,the proportion of the offspring will be

1. 25% black:25% blue:50% white

2. 50% black:50% white

3. 50% white:50% blue

4. 50% black:50% blue

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Correct Answer :

50\% black:50\% blue

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In snapdragons,tall is dominant over dwarf and real colour of the flower is incompletely dominant over the white and hybrid is pink.A pure tall white (TTrr) is crossed to a pure dwarf red (ttRR) and the plants of F1 generation are self-fertilized.What will be the expected genotype of the F2 plants

1. 9:3:3:1

2. 1:1:1:1

3. 3:6:3:2

4. All the plants will be phenotypically different

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Correct Answer :

3:6:3:2

Explanation :
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If enough crosses are made between male flies of the genotype Aa and the female flies of genotype aa to produce about 1000 offsprings,which one of the following is the most likely distribution of genotype in the offsprings

1. 750 Aa:250 aa

2. 481 aa:519 aa

3. 249 aa:751 aa

4. 243 AA:517 aa:240 aa

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Correct Answer :

481 aa:519 aa

Explanation :
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In an example of incomplete dominance,pure red flowers are crossed with pure white flowers and the F1 individuals have pink flowers,which one of the following is not correct

1. Half of the offspring of the pink flowers will be homozygous if the pink flowers are self-pollinated

2. The gene of the hybrid pink flowers will segregate if self-pollinated

3. Pink flowers will produce only pink flowers

4. Pink flowers will produce three kinds of flowers if self-pollinated

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Correct Answer :

Pink flowers will produce only pink flowers

Explanation :
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