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2 years ago

Plant spores are usually

Biology

1 answer:

max2010maxim [7]2 years ago

4 0

Answer:

The correct answer will be option- A

Explanation:

Spores are the reproductive unit produced as a result of sexual reproduction and asexual reproduction in both lower and higher plants.

The plant groups like Fungi, Algae, Bryophytes, Pteridophytes and Gymnosperms produce these spores which provides adaptation as they can be dispersed for the long-distance as well as germinate and form an organism.

The spores are formed by the process of sporogenesis which forms four spores from a diploid structure their meiosis which reduces the genetic material to half and maintain the haploid ploidy number.

Thus, option-A is the correct answer.

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2 years ago

Dihybrid crosses can be used to predict two independent alleles in the future generation. In echidnas, the allele for brown fur

Mrac [35]

Answer:

25% of the offsprings will be BBCC

Explanation:

This is a typical dihybrid cross involving two distinct genes. One coding for fur colour and the other for claw sharpness. The allele for brown fur (B) is dominant over the allele for black fur (b) in the first gene while the allele for sharp claws (C) is dominant over the allele for dull claws (c) in the second gene.

In a cross between parents with genotypes: BbCc x BBCC , each parent will produce four possible allelic combinations of gametes as follows:

BbCc: BC, Bc, bC, bc

BBCC: BC, BC, BC, BC

Using these gametes in a punnet square (see attached image), 16 possible offsprings will be produced with four distinct genotypes:

BBCC (4)

BBCc (4)

BbCC (4)

BbCc (4)

According to the question, an offspring that is homozygous dominant for both traits will possess a genotype: BBCC

N.B: Homozygous dominant means contains same alleles for the dominant trait.

Hence, offsprings with genotype, BBCC, from this cross are expected to be 4 out of the 16 possible offsprings. Hence, the percentage is 4/16 × 100 = 25%.

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3 years ago