Question

Q2
In cacti, long arms (A) are dominant to short arms (a). Suppose 2 heterozygous cacti
are crossed. What percentage of their offspring are expected to have short arms?
A 0%
B 25%
C 75%
100%

Answer 1

Answer:

aqbc123

Explanation:

Answer 2

If heterozygous cacti are crossed, 25% of offspring are expected to have short arms (aa).

• According to this question, a gene coding for arm length in cacti is involved. The long arm (A) is said to be dominant over short arm (a).

• If two heterozygous cacti are crossed i.e. Aa × Aa, the following gametes will be formed by each heterozygous parent: A and a.

• The fertilization of these two gametes (A and a) will give rise to the following genotype of offsprings: AA, Aa, Aa, and aa (see attached image).

• Genotypes AA, Aa have long arms while genotype aa have short arms. Since 1/4 of offsprings have genotype 'aa', hence, 1/4 × 100 = 25% are expected to have short arms (aa).

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