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Yakvenalex [24]
3 years ago
7

A similarity between ice wedging and plant root growth is that the crack in a rock can slowly grow larger over time. Both can ca

use a rock to break as a crack becomes progressively larger.
A) True
B) False
Biology
1 answer:
alisha [4.7K]3 years ago
3 0

Answer:

true

Explanation:

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Which event was important to the beginning of Christianity?
iren2701 [21]

Answer:

probably the life and death of Jesus christ

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2 years ago
___ is the process that facilitates the equal partitioning of replicated chromosomes into two identical groups.
OLga [1]
Mitosis is the process that facilitates the equal partitioning
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3 years ago
Read 2 more answers
Meiosis guarantees that in a sexual life cycle, offspring will inherit one complete set of chromosomes (and their associated gen
Alecsey [184]

Answer:

In meiosis I, crossing over during prophase and independent assortment during anaphase creates sets of chromosomes with new combinations of alleles. Genetic variation is also introduced by random fertilization of the gametes produced by meiosis.

Explanation:

The pairing of homologues at the beginning of meiosis I ensures that each gamete receives one member of each pair. The pairing of homologues brings together the near-identical sequences found on each chromosome, and this sets the stage for crossing over.Following crossing over, at least two of the four chromatids become unique, unlike those of the parent.The frequency of recombination is not uniform throughout the genome. Some areas of some chromosomes have increased rates of recombination, while others have reduced rates of recombination . Recombination or crossing over occurs during prophase I. Homologous chromosomes – 1 inherited from each parent – pair along their lengths, gene by gene. Breaks occur along the chromosomes, and they rejoin, trading some of their genes. The chromosomes now have genes in a unique combination.Independent assortment is the process where the chromosomes move randomly to separate poles during meiosis. A gamete will end up with 23 chromosomes after meiosis, but independent assortment means that each gamete will have 1 of many different combinations of chromosomes. This reshuffling of genes into unique combinations increases the genetic variation  Slightly different sequences in the genetic code of different individuals from the same species. This is important for species adaptation to occur in a population and explains the variation we see between siblings with the same parents.

6 0
3 years ago
A female rabbit heterozygous at two genes (named A and B) is test-crossed with a male rabbit. Their progeny include 442 A/a;B/b,
natta225 [31]

Answer:

The genes are linked and 10 mu apart.

Explanation:

A female AaBb rabbit is test crossed with a male rabbit (aabb). The male can only produce<em> ab</em> gametes (all the progeny will have ab on one of the homologous chromosomes).

If the genes assorted independently, the female would produce 4 types of gametes with the same frequency: 1/4 AB, 1/4 Ab, 1/4 aB and 1/4 ab.

However, the observed AB and ab gametes were much more frequent than Ab and aB, which means that the genes are linked and alleles on the same chromosome do not assort independently during meiosis.

Recombination is a rare event, so the most abundant gametes are the parentals. That is how we know that the mother had the AB/ab genotype. The recombinant gametes therefore are Ab and aB.

Distance (mu) = # Recombinants × 100/ Total progeny

Distance = (54 + 46) × 100/ 1000

Distance =  100 × 100/1000

Distance = 10 mu

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3 years ago
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