YR and Yr
The human gametes are Male gametes are sperm and female gametes are eggs. And the gametes chromosome numbers are 42.
Reproductive cells or gametes.
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.
4 haploid cells
Male gametes are made in the testis. male gametes are more-often called sperm.
4
During crossing over in meiosis, four genetically distinct gametes are produced.
In the absence of crossing over during meiosis, four genetically distinct gametes are produced.
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
If crossing over does not occur during meiosis, two genetically distinct gametes are produced.
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.
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
1:3:1 3:1 9:3:3:1 4:1
The possible genotypes of gametes are determined by the genetic makeup of an individual and can include combinations of dominant and recessive alleles.
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'
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.
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