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Darya [45]
3 years ago
7

In a BB x bb cross

Biology
2 answers:
Anna71 [15]3 years ago
5 0

Answer:

a. 100% of the offspring will have the Bb genotype

Explanation:

In a BB x bb cross, the one with BB genotype produces B gamete, while the other only produces b gamete.

Therefore, the zygote in this cross has Bb genotype.

Nikitich [7]3 years ago
5 0

Answer:

a.

100% of the offspring will have the Bb genotype

Explanation:

This cross involves a single gene that has two alternative forms called ALLELES. One allele is 'B' and the other is 'b'. In the cross, both parents are purebreeding or homozygous i.e. they contain identical alleles for a particular trait (BB and bb). Therefore, according to Mendel's law of segregation, the alleles of each parent will separate into gametes during meiosis.

Parent 'BB' will produce gametes containing allele 'B' while parent 'bb' will produce gametes containing allele 'b'. Each gametes will then combine randomly. Since only gametes B and b are produced by each parent, all the offsprings produced will have a heterozygous genotype: Bb. Hence, 100% of the F1 offsprings will possess Bb genotype.

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In fruit flies, long wings (W) are dominant over short wings (w), and brown pigments (N) are dominant over yellow pigments (n).
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Answer:

WwNn

Explanation:

  • Long wings (W) are dominant over short wings (w)
  • Brown pigments (N) are dominant over yellow pigments (n)

A fly that is homozygous dominant for both traits (WWNN) is crossed with a fly that is homozygous recessive for both traits (wwnn).

All gametes produced by the WWNN individual will be <em>WN,</em> and all gametes produced by the homozygous recessive individual will be <em>wn</em>.

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