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Name the 2 human gametes and tell their chromosome number?
The human gametes are Male gametes are sperm and female gametes are eggs. And the gametes chromosome numbers are 42.
Sperm and eggs are known as what?
Reproductive cells or gametes.
Why do gametes need 12 the number of chromosomes of a regular body cell?
Gametes require half the number of chromosomes of a somatic (regular) cell as gametes are the sex cells. When gametes combine to make a zygote (a fertilised cell), the complete number of chromosomes will be present.
Meiosis typically results in the production of what?
4 haploid cells
Where are the gametes produced in men and women?
Male gametes are made in the testis. male gametes are more-often called sperm.
How many types of gametes could be produced by a YyRr pea plat?
4
How many genetically distinct gametes are produced after crossing over during meiosis?
During crossing over in meiosis, four genetically distinct gametes are produced.
How many genetically distinct gametes are produced in the absence of crossing over during meiosis?
In the absence of crossing over during meiosis, four genetically distinct gametes are produced.
What is dependent assortment?
a hypothesis of getting an offspring with 3:1 ratio Mendel have found that only independent assortment works because independent assortment could predict all of the phenotypic appearances for example, 1) when two true-breading peas cross YYRR*yyrr "Y=yellow, y=green", "R=round, r=wrinkled" 2) all of their offsprings in the First Generation will be YyRr, then when those also cross YyRr*YyRr 3)the result in Second Generation will be in a ratio of 3:1 and the phenotype will be 25% YYRR "yellow-round" 50% YyRr "yellow-round" 25% yyrr "green-wrinkled" Which after all cannot be true because some of the other possible phynotypes are not shown such as Yyrr "yellow-wrinkled" or yyRr "green-round" That's why Mendel thought that independent assortment represents wider and phenotypes Resource from: Biology author:Campbell.Reece, 8th edition thanks
How many genetically distinct gametes are produced if crossing over does not take place during meiosis?
If crossing over does not occur during meiosis, two genetically distinct gametes are produced.
What is the difference between the gametes produced without corssing over and the ones produced with crossing over?
Gametes produced without crossing over are genetically identical to the parent cell, whereas gametes produced with crossing over have a mix of genetic material from both parents due to exchange of genetic material between homologous chromosomes. Crossing over increases genetic diversity in offspring.
How will you calculate the phenotype ratio of a cross between dihybrid F1 plants that are heterozygous for 2 dominant traits?
Using a Punnett square, you can calculate the genotype and phenotype of two dihybrid plants. For example, if you have two heterozygous individuals for two dominant traits (we'll pretend the genotype is YyRr), put them into a Punnett square, and you'll get these results: YYRR: 1, YYRr: 2, YYrr: 1 YyRR: 2, YyRr: 4, Yyrr: 2 yyRR: 1, yyRr: 2, yyrr: 1 Phenotypes expressed: Dominant for both traits: 9/16 Dominant for trait 1: 3/16 Dominant for trait 2: 3/16 Recessive for both traits: 1/16 Therefore, the ratio would be 9:3:3:1
In considering the cross YyRr x YyRr the phenotype ratios of the F2 generation will?
1:3:1 3:1 9:3:3:1 4:1
What are the possible genotypes of the gametes?
The possible genotypes of gametes are determined by the genetic makeup of an individual and can include combinations of dominant and recessive alleles.
What are the possible gametes for AAA AAA?
A gamete is haploid (1N) so 'Aa' & 'AA' are diploid and during cell division (mitosis) gametes are formed and then 2 gametes merge together to make a diploid (think of sperm and egg, each is haploid or 1N, when fertilization occurs the egg and sperm form 1 cell that is 2N or diploid). So the possible gametes for 'Aa' would be 'A' & 'a' while for 'AA' the only gametes possible are 'A' If the question is asking what the possible gametes are for 'AaBB' the haploid (gamete) can be 'AB' or 'aB'
What does crossing over ensure about the gametes that are formed during meiosis?
Crossing over ensures genetic diversity in the gametes formed during meiosis. It promotes the exchange of genetic material between homologous chromosomes, increasing the variability of offspring produced.
How do you determine the possible gametes in a dihybrid cross?
Using a punnett square - you write the possible gamete combinations of one parent across the top and those of the other down the side.By filling in the square, you determine all the possible allele combinations of the offspring.XRDRdrDrdRDRRDDRRDdRrDDRrDdRdRRDdRRddRrDdRrddrDRrDDRrDdrrDDrrDdrdRrDdRrddrrDdrrdd
